MCQOPTIONS
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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.
| 2301. |
Which of the following molecules has a dipole moment? |
| A. | CBr4 |
| B. | CH2=CH2 |
| C. | BF3 |
| D. | SO2 |
| Answer» E. | |
| 2302. |
Which of the following intermediates is pyramidal in shape? |
| A. | H3C(+) |
| B. | H2C: |
| C. | H3C:(-) |
| D. | HC≡C:(-) |
| Answer» D. HC≡C:(-) | |
| 2303. |
Which one of the following compounds contains the greatest number of sp3 hybridized carbon atoms? |
| A. | 1,4-Cyclooctadiene |
| B. | 2,5-dimethyl-2,3,4-hexatriene |
| C. | Phenylacetylene |
| D. | 1,1-diallyl-3,3-divinylcyclobutane |
| Answer» E. | |
| 2304. |
Which of the following isomers has the lowest heat of combustion? |
| A. | cis-1,2-dimethylcyclohexane |
| B. | trans-1,2-dimethylcyclohexane |
| C. | cis-1,3-dimethylcyclohexane |
| D. | trans-1,3-dimethylcyclohexane |
| Answer» D. trans-1,3-dimethylcyclohexane | |
| 2305. |
How many electrons occupy the bonding molecular orbitals of a CN triple bond? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 2306. |
Compound Z, C8H14, reacts with excess hydrogen and a Pt catalyst to give 2,5-dimethylhexane as the only product. Z diplays three 13C nmr signals, all at higher field than 100 ppm, and does not absorb in the UV at wavelengths greater than 200 nm. Oxidation of Z by either ozone or potassium permanganate produces a single C4H8O2 ? |
| A. | 2,5-dimethyl-3-hexyne |
| B. | trans-2,5-dimethyl-3-hexene |
| C. | cis-2,5-dimethyl-3-hexene |
| D. | 2,5-dimethyl-2,4-hexadiene |
| Answer» B. trans-2,5-dimethyl-3-hexene | |
| 2307. |
What structural change takes place when an alkene undergoes a Simmons-Smith reaction? |
| A. | addition of ethene gives a cyclobutane derivative |
| B. | the double bond is shifted to a more substituted location |
| C. | the double bond is converted to a triple bond. |
| D. | a methylene group is added to give a cyclopropane derivative. |
| Answer» E. | |
| 2308. |
Which of the following reactions of cyclohexene may be considered an oxidation? |
| A. | Addition of hydrogen (Pt catalyst) to give cyclohexane |
| B. | Addition of HBr to give bromocyclohexane |
| C. | Epoxidation by perbenzoic acid to give cyclohexene oxide |
| D. | Mercuric acetate catalyzed hydration to give cyclohexanol |
| Answer» D. Mercuric acetate catalyzed hydration to give cyclohexanol | |
| 2309. |
Which one of the following compounds contains the greatest number of sp2 hybridized carbon atoms? |
| A. | 1,4-Cycloheptadiene |
| B. | 2,5-dimethyl-2,3,4-hexatriene |
| C. | Phenylacetylene |
| D. | 1,1-diallyl-3,3-divinylcyclobutane |
| Answer» E. | |
| 2310. |
Which one of the following compounds contains the greatest number of sp hybridized carbon atoms? |
| A. | 1,4-Cyclooctadiene |
| B. | 2,5-dimethyl-2,3,4-hexatriene |
| C. | Phenylacetylene |
| D. | 1,1-diallyl-3,3-divinylcyclobutane |
| Answer» C. Phenylacetylene | |
| 2311. |
A chiral C6H12 hydrocarbon undergoes catalytic hydrogenation to yield an achiral C6H14 product. What is the starting compound? |
| A. | cis-2-hexene |
| B. | 3-methyl-2-pentene |
| C. | 4-methyl-2-pentene |
| D. | 3-methyl-1-pentene |
| Answer» E. | |
| 2312. |
Reaction of 3,3,6,6-tetramethyl-1,4-cyclohexadiene, first with excess aqueous mercuric acetate, then followed by sodium borohydride reduction, produces a mixture of isomeric C10H20O2 alcohols. Excluding enantiomers, how many isomeric products may be formed in this reaction? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 2313. |
What is the relative rate of addition of HBr to I:1,3-pentadiene; II:1,4-pentadiene; and III:1-pentyne? |
| A. | I u003e II u003e III |
| B. | III u003e II u003e I. |
| C. | II u003e I u003e III. |
| D. | III u003e I u003e II. |
| Answer» B. III u003e II u003e I. | |
| 2314. |
Which of the following reagents and conditions would best serve to convert 1-butyne to 1,1-dibromobutane? |
| A. | 2 equivalents of HBr, no peroxides |
| B. | 2 equivalents of HBr, with peroxides. |
| C. | 1 equivalent of Br2. |
| D. | 2 equivalents of Br2 followed by i equivalent of KOH. ________________________________________ |
| Answer» C. 1 equivalent of Br2. | |
| 2315. |
Reaction of 1,1-dibromopentane with three equivalents of NaNH2 in ether is followed by treatment with 0.1M HCl at 0º C. What is the product? |
| A. | cyclopentene. |
| B. | 1,2-pentadiene |
| C. | 2-pentyne. |
| D. | 1-pentyne. |
| Answer» E. | |
| 2316. |
A C6H10 hydrocarbon forms an insoluble silver salt when treated with silver nitrate in ethanolic ammonia. Acid catalyzed hydration with a HgSO4 catalyst generates a single C6H12O ketone, and pemanganate oxidation yields a C5H_____. |
| A. | cyclohexene. |
| B. | methylenecyclopentane. |
| C. | 1-hexyne. |
| D. | 3-hexyne |
| Answer» D. 3-hexyne | |
| 2317. |
Which reaction conditions would best convert 3-hexyne to cis-3-hexene? |
| A. | Pt catalyst and H2. |
| B. | Lindlar's Pd catalyst and H2. |
| C. | Na in liquid NH3. |
| D. | NaNH2 in liquid NH3 |
| Answer» C. Na in liquid NH3. | |
| 2318. |
A C8H14 hydrocarbon (X) is reduced by sodium in liquid ammonia to a single C8H16 product (Y). Both of these compounds undergo hydrogenation (Pt catalyst) to give 2,5-dimethylhexane. Ozonolysis of Y with an oxidative workup produces a single C4H8? |
| A. | X is 2,5-dimethyl-3-hexyne ; Y is cis-2,5-dimethyl-3-hexene. |
| B. | X is 2,5-dimethyl-3-hexyne ; Y is trans-2,5-dimethyl-3-hexene. |
| C. | X is 2.5-dimethyl-1,5-hexadiene ; Y is 2,5-dimethyl-3-hexyne. |
| D. | X is 2,5-dimethyl-2,4-hexadiene ; Y is cis-2,5-dimethyl-3-hexene. ________________________________________ |
| Answer» C. X is 2.5-dimethyl-1,5-hexadiene ; Y is 2,5-dimethyl-3-hexyne. | |
| 2319. |
Reaction of 1-hexene with NBS (N-bromosuccinimide) forms two isomeric bromohexenes, one of which is 3-bromo-1-hexene. Which of the following is the other isomer? |
| A. | 1-bromo-2-hexene |
| B. | 6-bromo-1-hexene |
| C. | 1-bromo-1-hexene |
| D. | 2-bromo-1-hexene |
| Answer» B. 6-bromo-1-hexene | |
| 2320. |
Which of the following isomeric hexenes will have the smallest heat of hydrogenation? |
| A. | 4-methyl-1-pentene |
| B. | 4-methyl-2-pentene |
| C. | 4-methyl-2-pentene |
| D. | 2-methyl-2-pentene |
| Answer» E. | |
| 2321. |
Peroxide induced reaction of carbon tetrachloride with 1-butene produces which of the following? |
| A. | 1,1,1,3-tetrachloropentane. |
| B. | 1,1,1,2-tetrachloropentane. |
| C. | 1-chloro-2-trichloromethylbutane. |
| D. | 1,1-dichloro-2-ethylcyclopropane. |
| Answer» B. 1,1,1,2-tetrachloropentane. | |
| 2322. |
Two C4H6 isomers give the same C4H8O product from HgSO4 catalyzed hydration in aqueous acid. However, these isomers give different C4H6____ |
| A. | cyclobutene and methylenecyclopropane |
| B. | 1,2-butadiene and 1,3-butadiene |
| C. | 1-butyne and 2-butyne |
| D. | 2-butyne and cyclobutene |
| Answer» D. 2-butyne and cyclobutene | |
| 2323. |
Two C5H8 isomers undergo catalytic (Pt) hydrogenation to form the same C5H10 product. On ozonolysis followed by oxidative workup (H2O2), one isomer gave a C5 a cyclopentene and 1-pentyne b cyclopentene and 1-methylcyclobutene c 1-methylcyclobutene and 3-methylcyclobutene d cyclopentene and 3-methylcyclobutene cyclopentene and 1-methylcyclobutene |
| A. | cyclopentene and 1-pentyne |
| B. | cyclopentene and 1-methylcyclobutene |
| C. | 1-methylcyclobutene and 3-methylcyclobutene |
| D. | cyclopentene and 3-methylcyclobutene |
| Answer» C. 1-methylcyclobutene and 3-methylcyclobutene | |
| 2324. |
Treatment of 1-methylcyclohexene with an ether solution of diborane ( B2H6 ), followed by reaction with alkaline H2O2 produces what product? |
| A. | 1-methylcyclohexanol |
| B. | cis-1-methylcyclohexane-1,2-diol |
| C. | cis-2-methylcyclohexanol |
| D. | trans-2-methylcyclohexanol |
| Answer» E. | |
| 2325. |
How many sp hybridized carbon atoms are present in a molecule of 3-methyl-4-vinyl-1,2-heptadien-5-yne? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 2326. |
Considering that the angles of a regular pentagon are 108º, why is cyclopentane not planar? |
| A. | all the carbons are sp2 hybridized, so there is considerable angle strain. |
| B. | The C-C bonds are formed by overlap of p-orbitals, so the 90º angle results in large angle strain. |
| C. | The cyclic overlap of bonding orbitals results in anti-aromaticity destabilization |
| D. | The five C-C bonds have eclipsing strain |
| Answer» E. | |
| 2327. |
The product from OsO4 hydroxylation of trans-2-butene will be? |
| A. | achiral |
| B. | optically active |
| C. | racemic |
| D. | a meso compound |
| Answer» D. a meso compound | |
| 2328. |
Which of the following olefins would you expect to react most rapidly with concentrated sulphuric acid ? |
| A. | H2C=CH2 |
| B. | CH3)2C=CH2 |
| C. | Cl2C=CCl2 |
| D. | CF3CH=CH2 |
| Answer» C. Cl2C=CCl2 | |
| 2329. |
Which compound is a likely product from addition of Cl2 to 1-butene? |
| A. | CH3CH2CH2CHCl2 |
| B. | CH3CH2CHClCH2Cl |
| C. | ClCH2CH2CH2CH2Cl |
| D. | CH3CH2CCl2CH3 |
| Answer» C. ClCH2CH2CH2CH2Cl | |
| 2330. |
The product from bromine addition to trans-2-butene will be ? |
| A. | optically active |
| B. | racemic |
| C. | a meso compound |
| D. | chiral |
| Answer» D. chiral | |
| 2331. |
Addition of 1 equivalent ofnbromine to 2,4-hexadiene at 0º C gives 4,5-dibromo-2-hexene plus an isomer. Which of the following is that isomer? |
| A. | 5,5-dibromo-2-hexene |
| B. | 2,5-dibromo-3-hexene |
| C. | 2,2-dibromo-3-hexene |
| D. | 2,3-dibromo-4-hexene |
| Answer» C. 2,2-dibromo-3-hexene | |
| 2332. |
Which of the following is not an electrophile? |
| A. | C2H5OC2H5 |
| B. | BF3 |
| C. | [CH3]3C(+) |
| D. | HOCl |
| Answer» B. BF3 | |
| 2333. |
Which of the following C6H12 isomers has the largest heat of combustion? |
| A. | cyclohexane |
| B. | methylcyclopentane |
| C. | ethylcyclobutane |
| D. | propylcyclopropane |
| Answer» E. | |
| 2334. |
The most typical reaction of simple alkenes is .. |
| A. | electrophilic substitution |
| B. | nucleophilic substitution |
| C. | electrophilic addition |
| D. | nucleophilic addition |
| Answer» D. nucleophilic addition | |
| 2335. |
A tertiary carbocation (carbonium ion) is more stable than either a secondary or primary carbocation because ... |
| A. | it carries three positive charges |
| B. | it has a pyramidal configuration |
| C. | it has a trigonal planar configuration |
| D. | it possesses three electron-donating substituent groups |
| Answer» E. | |
| 2336. |
Which of the following dimethylcyclobutanes is chiral ? |
| A. | trans-1,2-dimethylcyclobutane |
| B. | cis-1,2-dimethylcyclobutane |
| C. | trans-1,3-dimethylcyclobutane |
| D. | cis-1,3-dimethylcyclobutane |
| Answer» B. cis-1,2-dimethylcyclobutane | |
| 2337. |
The radical halogenation of 2-methylpropane gives two products: (CH3)2CHCH2X (minor) and (CH3)3CX (major) Chlorination gives a larger amount of the minor product than does bromination, Why? |
| A. | Bromine is more reactive than chlorine and is able to attack the less reactive 3º C-H. |
| B. | Bromine atoms are less reactive (more selective) than chlorine, and preferentially attack the weaker 3º C-H bond |
| C. | The methyl groups are more hindered to attack by the larger bromine atom. |
| D. | Bromination is reversible and the more stable 3º-alkyl bromide is formed exclusively. |
| Answer» C. The methyl groups are more hindered to attack by the larger bromine atom. | |
| 2338. |
The IUPAC name for (CH3)2CHCH(CH3)CH2CH=CH2 is____ |
| A. | 4,5-dimethyl-1-hexene |
| B. | 4,5,5-trimethyl-1-pentene |
| C. | 2,3-dimethyl-5-hexene |
| D. | 4-methyl-4-isopropyl-1-butene |
| Answer» B. 4,5,5-trimethyl-1-pentene | |
| 2339. |
Limiting your answer to cycloalkanes and ignoring stereoisomers, how many C6H12 constitutional isomers are there? |
| A. | 6 |
| B. | 9 |
| C. | 11 |
| D. | 13 |
| Answer» D. 13 | |
| 2340. |
Which isomer of hexane has only two different sets of structurally equivalent hydrogen atoms.? |
| A. | 2,2-dimethylbutane |
| B. | 2-methylpentane |
| C. | 3-methylpentane |
| D. | 2,3-dimethylbutane |
| Answer» E. | |
| 2341. |
How many isomeric pentenes (C5H10) exist? (count stereoisomers as well) |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 2342. |
The preferred conformation of cis-1,3-dimethylcyclohexane is ? |
| A. | chair--diaxial |
| B. | chair--diequatorial |
| C. | chair--one axial / one equatorial |
| D. | boat--mixed orientations |
| Answer» C. chair--one axial / one equatorial | |
| 2343. |
A C6H12 compound reacts with ozone to yield a single C3H6O product. Gas phase free radical bromination o?f the hydrocarbon gives a single C6H11Br product. A likely identification of this compound is |
| A. | cyclohexane |
| B. | cyclohexene |
| C. | 3-hexene |
| D. | 2,3-dimethyl-2-butene |
| Answer» E. | |
| 2344. |
Ratio of energy of a photon of 2000 A° .Wavelength radiation to that of 4000A° is: |
| A. | . ¼ |
| B. | 4 |
| C. | ½ |
| D. | 2 |
| Answer» E. | |
| 2345. |
Rutherford’s alpha particle scattering experiment eventually led to the conclusion that? |
| A. | mass and energy are related. |
| B. | electrons occupy space around the nucleus |
| C. | neutrons are buried deep in the nucleus |
| D. | the point of impact with matter can be precisely determined |
| Answer» C. neutrons are buried deep in the nucleus | |
| 2346. |
The half life period of a radioactive element is 140 days. After 560 days, one gram of the element will reduce to? |
| A. | 1/16 g |
| B. | 1/8 g |
| C. | ¼ g |
| D. | ½ g |
| Answer» B. 1/8 g | |
| 2347. |
There are four constitutional isomers having the formula C4H9Cl .Which of the following would be a correct IUPAC name for one of these isomers? |
| A. | 1-chloro-2-methylpropane |
| B. | 3-chlorobutane |
| C. | 2-chloro-2-methylbutane |
| D. | 1-chloro-3-methylpropane |
| Answer» B. 3-chlorobutane | |
| 2348. |
What is the IUPAC name for CH3CH2C(CH3)2CH2CH(CH3)2? |
| A. | 2,2,5-trimethylhexane |
| B. | 3,3,5-trimethylhexane |
| C. | 2,4,4-trimethylhexane |
| D. | 1,1,3,3-tetramethylpentane |
| Answer» D. 1,1,3,3-tetramethylpentane | |
| 2349. |
The increasing order (lowest) first for the values of e/m (charge/mass)for electron e, proton p, neutron n and alpha particle α is: |
| A. | . n, α,p,e |
| B. | . e,p,n, α |
| C. | . n,p,e, α |
| D. | n,p, α,e |
| Answer» B. . e,p,n, α | |
| 2350. |
electromagnetic radiation with maximum wavelength |
| A. | infrared |
| B. | radiowave |
| C. | ultraviolet |
| D. | X-ray |
| Answer» C. ultraviolet | |