MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 200950 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge knowledge and support exam preparation. Choose a topic below to get started.
| 2451. |
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is? |
| A. | Dalton's law |
| B. | Gay Lussac's law |
| C. | Henry's law |
| D. | Raoult's law |
| Answer» D. Raoult's law | |
| 2452. |
The number of d-electrons in Fe2 (Zn= 26) is not equal to that of? |
| A. | p-electrons in Ne(Z = 10) |
| B. | s-electrons in Mg(Z = 12 |
| C. | d-electrons in Fe(Z = 26) |
| D. | p-electrons in CI(Z = 17) |
| Answer» E. | |
| 2453. |
The metal used to recover copper from a solution of copper sulphate is? |
| A. | Na |
| B. | Ag |
| C. | Hg |
| D. | Fe |
| Answer» E. | |
| 2454. |
The most electronegative element among the following is? |
| A. | Sodium |
| B. | Bromine |
| C. | Fluorine |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 2455. |
The number of moles of solute present in 1 kg of a solvent is called its? |
| A. | Molality |
| B. | Molarity |
| C. | Normality |
| D. | Formality |
| Answer» B. Molarity | |
| 2456. |
Which of the following statements is not correct? |
| A. | A pair of enantiomeric compounds will have the same melting point. |
| B. | A pair of enantiomeric compounds will have the same solubility in ethanol. |
| C. | A pair of enantiomeric compounds will have exactly the same functional groups. |
| D. | A pair of enantiomeric compounds will have identical optical rotations. |
| Answer» E. | |
| 2457. |
Which of the following statements is not an essential feature of an optically active compound? |
| A. | The molecules of an optically active compound will be dissymetric or asymmetric. |
| B. | The molecules of an optically active molecule must have at least one stereogenic site. |
| C. | An optically active compound's molecular configuration will not be identical with its mirror image |
| D. | An optically active compound will have at least one stereoisomer. |
| Answer» C. An optically active compound's molecular configuration will not be identical with its mirror image | |
| 2458. |
The Cope rearrangement,[3,3]-sigmatropic shift, of meso-3,4-dimethyl-1,5-hexadienevgives which of the following? |
| A. | 1,7-octadiene |
| B. | (2Z,6Z)-2,6-octadiene |
| C. | (2E,6Z)-2,6-octadiene |
| D. | (2E,6E)-2,6-octadiene |
| Answer» D. (2E,6E)-2,6-octadiene | |
| 2459. |
The antimalarial alkaloid quinine, C20H24N2O2, is optically active. An ethanol solution of 8g quinine in 100mL displays a rotation of -13.6º in a 1dm polarimeter tube. What is the specific rotation of quinine? |
| A. | -85º |
| B. | -170º |
| C. | -43º |
| D. | -26º |
| Answer» C. -43º | |
| 2460. |
The thermal electrocyclic closure of (2E,4Z,6E)-2,4,6-octatriene gives which of the following? |
| A. | cis-5,6-dimethyl-1,3-cyclohexadiene |
| B. | trans-5,6-dimethyl-1,3-cyclohexadiene |
| C. | cis-3,6-dimethyl-1,4-cyclohexadiene |
| D. | cis-3,6-dimethyl-1,4-cyclohexadiene |
| Answer» B. trans-5,6-dimethyl-1,3-cyclohexadiene | |
| 2461. |
Reaction of 3-methyl-1,4-cycloheptadiene with excess perbenzoic acid (C6H5CO3H) forms a diepoxide product. How many stereoisomers, counting enantiomers, are expected from this reaction ? |
| A. | 4 (two pairs of enantiomers) |
| B. | 4 (two meso compounds and a pair of enantiomers) |
| C. | 5 (two pairs of enantiomers and a meso compound) |
| D. | 6 (two pairs of enantiomers and two meso compounds) |
| Answer» C. 5 (two pairs of enantiomers and a meso compound) | |
| 2462. |
What common symmetry elements if any are found in the stable chair conformer of trans-1,2-dichlorocyclohexane? |
| A. | A single mirror plane and a C2 rotational axis. |
| B. | A single mirror plane and a C3 rotational axis |
| C. | Two orthogonal mirror planes and a C2 rotational axis |
| D. | A single C2 rotational axis but no mirror plane |
| Answer» E. | |
| 2463. |
Which of the followingndescriptive terms would never be applied to a pair of stereoisomersn? |
| A. | Enantiomers |
| B. | Tautomers |
| C. | Diastereomers |
| D. | Epimers |
| Answer» C. Diastereomers | |
| 2464. |
What common symmetry elements if any are found in the stable chair conformer of trans-1,4-dichlorocyclohexane? |
| A. | A single mirror plane and a C2 rotational axis. |
| B. | A C3 rotational axis but no mirror plane. |
| C. | Two orthogonal mirror planes and a C2 rotational axis |
| D. | A single C2 rotational axis but no mirror plane |
| Answer» B. A C3 rotational axis but no mirror plane. | |
| 2465. |
What kind of reagent would be needed to resolve a racemic amine, such as 2-aminobutane ? |
| A. | the pure optically active amine to serve as a template for crystallization |
| B. | an achiral carboxylic acid to give a racemic mixture of amine salts. |
| C. | An enantiomerically pure chiral carboxylic acid to give a diastereomeric mixture of amine salts. |
| D. | A racemic chiral carboxylic acid to give a complete mixture of isomeric amine salts. |
| Answer» D. A racemic chiral carboxylic acid to give a complete mixture of isomeric amine salts. | |
| 2466. |
If two isomers have been classified correctly as epimers, they may also be called? |
| A. | Diastereomers |
| B. | Enantiomers |
| C. | Tautomers |
| D. | Conformers |
| Answer» B. Enantiomers | |
| 2467. |
Pure (S)-2-butanol has a specific rotation of 13.52 degrees. You have made and purified a sample that has a calculated specific rotation of 6.76 degrees. What can you conclude about this sample? |
| A. | The sample has completely racemized |
| B. | 50% the sample has rearranged into a meso isomer |
| C. | 50% of the sample has racemized |
| D. | 75% of the sample has racemized |
| Answer» D. 75% of the sample has racemized | |
| 2468. |
Which of the following statements must be true for two pure chiral isomers ? |
| A. | They must be enantiomers |
| B. | They must be diastereomers |
| C. | They must be stereoisomers |
| D. | they must be optically active |
| Answer» E. | |
| 2469. |
How many stereoisomers of (CH3)2CHCH=CHCH2CH(OH)CH2Br are possible? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 2470. |
Which of the following statements is true for a pair of diastereomers? |
| A. | They will have identical physiological properties |
| B. | They will have specific rotations of opposite sign |
| C. | They will have identical chemical properties (e.g. reactivity |
| D. | They will have different physical properties. |
| Answer» E. | |
| 2471. |
The optically active bromohydrin (1R, 2R)-2-bromocyclohexanol reacts with base to produce cyclohexene oxide (C6H10O). Which of the following statements is true? |
| A. | A racemic product is formed |
| B. | The observed optical rotation changes sign |
| C. | The observed optical rotation does not change sign |
| D. | The product is achiral |
| Answer» E. | |
| 2472. |
While the world was ______ to the happenings in Washington and New york, America's political class was _______ by the attacks. |
| A. | watching, worried |
| B. | alert, concerned |
| C. | averse, excited |
| D. | none |
| Answer» D. none | |
| 2473. |
Two equivalents of OsO4 hydroxylate one equivalent of 1,5-cyclooctadiene. How many stereoisomeric cyclooctane-1,2,5,6-tetraols will be formed? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 2474. |
Which of the following isomeric dienes is chiral? |
| A. | 2,3-pentadiene |
| B. | 3-methyl-1,2-butadiene |
| C. | 2-methyl-1,3-butadiene |
| D. | none, all are achiral |
| Answer» B. 3-methyl-1,2-butadiene | |
| 2475. |
Two equivalents of bromine add to one equivalent of 1,7-octadiene. How many stereoisomeric tetrabromides will be formed? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 2476. |
Consider the Fischer projection formula for (S)-2-chlorobutaneWhich of the following changes does not convert this structure to the (R)-enantiomer? |
| A. | Rotation 180º in the plane of the paper (or screen) |
| B. | Flipping the structure over (a 180º rotation out of the plane) |
| C. | Exchanging the two vertical substituents (i.e. top and bottom) |
| D. | Exchanging the two horizontal substituents (i.e. right and left) |
| Answer» B. Flipping the structure over (a 180º rotation out of the plane) | |
| 2477. |
When HOBr adds to 4-methylcyclopentene, how many new stereogenic centers are formed? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 2478. |
Designate the CIP priority order of the following C5H11- groups. (Lowest u003c Highest priority order)I CH3(CH2)4– II (CH3)3CC |
| A. | I u003c II u003c III u003c IV |
| B. | IV u003c III u003c II u003c I |
| C. | I u003c IV u003c II u003c III |
| D. | III u003c II u003c IV u003c I |
| Answer» D. III u003c II u003c IV u003c I | |
| 2479. |
Which conformation of cyclohexane has a C3 axis of symmetry? |
| A. | boat |
| B. | twist boat |
| C. | chair |
| D. | envelope |
| Answer» D. envelope | |
| 2480. |
Enantiomers are? |
| A. | Stereoisomers having non-identical mirror image configurations |
| B. | Stereoisomers that do not have non-identical mirror image configurations |
| C. | Stereoisomers having a mirror plane of symmetry |
| D. | Achiral stereoisomers |
| Answer» B. Stereoisomers that do not have non-identical mirror image configurations | |
| 2481. |
Hydration, by oxymercuation, of 3-methyl-1-butene gives 3-methyl-2-butanol.What is the observed rotation of this product, using a 20% solution in ethanol in a 1dm polarimeter cell?.Assume the specific roatation of the pure (S)-enantiomer to be 16º |
| A. | +3.2º |
| B. | -3.2º |
| C. | 180º (+ or -) |
| D. | 0º |
| Answer» E. | |
| 2482. |
An essential purpose of the criminal justice system is to enable purgation to take place; that is, to provide a _______ by which a community expresses its collective ________ the transgression of the criminal. |
| A. | catharsis, outrage at |
| B. | disclaimer, forgiveness of |
| C. | procedure, distaste for |
| D. | document, disapprobation of |
| Answer» B. disclaimer, forgiveness of | |
| 2483. |
An object that has no element of symmetry is called what? |
| A. | Tetrahedral |
| B. | achiral |
| C. | Siymmetric |
| D. | Asymmetric |
| Answer» E. | |
| 2484. |
His musical tastes are certainly ____ ; he has recordings ranging from classical piano performances to rock concerts, jazz and even Chinese opera. |
| A. | antediluvian |
| B. | eclectic |
| C. | harmonious |
| D. | sonorous |
| Answer» C. harmonious | |
| 2485. |
Which of the following must be true for an optically active compound? |
| A. | The molecular configuration is achiral |
| B. | The molecular configuration is chiral |
| C. | The compound is a racemic mixture of enantiomers |
| D. | The molecular configuration must have two or more stereogenic centers |
| Answer» C. The compound is a racemic mixture of enantiomers | |
| 2486. |
Stereoisomers differ from each other in what respect? |
| A. | Composition. |
| B. | Constitution |
| C. | Configuration |
| D. | Steric hindrance |
| Answer» D. Steric hindrance | |
| 2487. |
We can coax physical nature into ________ many of our wishes but we cannot ________ authority over it or make it change its ways one jot. |
| A. | granting, empower |
| B. | satiating, display |
| C. | satisfying, exercise |
| D. | stimulating, exercise |
| Answer» D. stimulating, exercise | |
| 2488. |
They refused to ________ any more evasive replies and decided to resolve the issue within the _______ of the major. |
| A. | notice, eccentricity |
| B. | brook, jurisdiction |
| C. | suffer, fortitude |
| D. | none |
| Answer» C. suffer, fortitude | |
| 2489. |
The spatial orientation of the atoms of a molecule is called its what? |
| A. | Constitution |
| B. | Configration |
| C. | Candedness |
| D. | composition |
| Answer» C. Candedness | |
| 2490. |
She was a/an ________ liar who had mastered the art of making untrue statements in a manner that sounded _________. |
| A. | congenial, creditable |
| B. | incorrigible, plausible |
| C. | convincing, illogical |
| D. | blatant, incongruous. |
| Answer» C. convincing, illogical | |
| 2491. |
Whereas off-Broadway theatre over the past several seasons has clearly ________ a talent for experimentation and improvisation, one deficiency in the commercial stage of late has been its marked incapacity for _______. |
| A. | manifested, spontaneity |
| B. | lampooned, theatrically |
| C. | cultivated, orthodoxy |
| D. | disavowed, histrionics |
| Answer» B. lampooned, theatrically | |
| 2492. |
The village headman was unlettered, but he was no fool, he could see through the ________ of the businessman's proposition and promptly _______ him down. |
| A. | deception, forced |
| B. | naivete, turned |
| C. | naivete, turned |
| D. | sophistry, turned |
| Answer» E. | |
| 2493. |
The _________ of opinion which emerged at a recently concluded seminar was that the problem of dowry cannot be _______ unless the law against it is made more stringent. |
| A. | divergence, managed |
| B. | convergence, appreciated |
| C. | consensus, tackled |
| D. | similarity, curbed |
| Answer» D. similarity, curbed | |
| 2494. |
The bonds present in N2O5 are? |
| A. | Only ionic |
| B. | Covalent and coordinate |
| C. | Only covalent |
| D. | Covalent and ionic |
| Answer» C. Only covalent | |
| 2495. |
The quality of _________ between individuals and the organization for which they work can be _________ to the benefit of both parties. |
| A. | life, conceptualized |
| B. | interaction, improved |
| C. | service, evaluated |
| D. | sophistication, developed |
| Answer» C. service, evaluated | |
| 2496. |
Although he was generally considered an extremely _________ individual, his testimony at the trial revealed that he had been very ________. |
| A. | intrepid, valiant |
| B. | guileless, hypocritical |
| C. | abstemious, temperate |
| D. | meek, timorous |
| Answer» C. abstemious, temperate | |
| 2497. |
The types of bonds present in CuSO4.5H2O are only? |
| A. | Electrovalent and covalent |
| B. | Electrovalent and coordinate covalent |
| C. | Electrovalent, covalent and coordinate covalent |
| D. | Covalent and coordinate covalent |
| Answer» D. Covalent and coordinate covalent | |
| 2498. |
If a junior executive neglects his professional development and _______ education, he can easily and quickly become obsolete in a world changing at _______ rates. |
| A. | higher, vulnerable |
| B. | management, supreme |
| C. | better, supreme |
| D. | continuing, dizzying |
| Answer» E. | |
| 2499. |
The ______ terrorist was finally _______ by the police |
| A. | famous, apprehended |
| B. | notorious, nabbed |
| C. | crafty, admonished |
| D. | renowned, caught |
| Answer» C. crafty, admonished | |
| 2500. |
To the embittered ex-philanthropist, all the former recipients of his charity were _________ as stingy with their thanks as they were wasteful of his largesse. |
| A. | louts |
| B. | Misers |
| C. | Ingrates |
| D. | prigs |
| Answer» D. prigs | |