MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Semicarbazones undergo acidic nucleophilic addition followed by dehydration to give N-substituted carbonyl derivatives. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Identify the N-substituted derivative of carbonyl compounds that are coloured compounds and are useful in the identification of aldehydes and ketones. |
| A. | Hydrazone |
| B. | Phenylhydrazone |
| C. | 2,4-Dinitrophenylhydrazone |
| D. | Semicarbazone |
| Answer» D. Semicarbazone | |
| 3. |
Which of the following products is formed when an aldehyde reacts with an amine in acidic medium? |
| A. | Imine |
| B. | Schiff’s base |
| C. | Oxime |
| D. | Hydrazone |
| Answer» C. Oxime | |
| 4. |
Acetone reacts with ethylene glycol in dry HCl gas to form _________ |
| A. | hemiacetals |
| B. | acetals |
| C. | cyclic acetals |
| D. | cyclic ketals |
| Answer» E. | |
| 5. |
The following acetal shown is formed by the reaction between ______ and ______ in the presence of dry HCl. |
| A. | methanal; methanol |
| B. | methanal; ethanol |
| C. | ethanal; methanol |
| D. | ethanal; ethanol |
| Answer» E. | |
| 6. |
The following is an addition product of the reaction between _______ and sodium bisulphite. |
| A. | formaldehyde |
| B. | acetaldehyde |
| C. | ethanone |
| D. | acetone |
| Answer» C. ethanone | |
| 7. |
The hydrolysis of the addition product of acetone and methyl magnesium iodide gives _______ |
| A. | ethyl alcohol |
| B. | isopropyl alcohol |
| C. | tert-Butyl alcohol |
| D. | phenol |
| Answer» D. phenol | |
| 8. |
Identify the catalyst in the nucleophilic addition of HCN to acetone. |
| A. | NaOH |
| B. | HCl |
| C. | NaCl |
| D. | NaCN |
| Answer» B. HCl | |
| 9. |
Which of the following is the most reactive towards hydrogen cyanide? |
| A. | Acetophenone |
| B. | Benzaldehyde |
| C. | p-Nitrobenzaldehyde |
| D. | p-Tolualdehyde |
| Answer» D. p-Tolualdehyde | |
| 10. |
What is the correct order of reactivity towards nucleophilic addition? |
| A. | Benzaldehyde > Benzophenone > Acetophenone |
| B. | Benzophenone > Benzaldehyde > Acetophenone |
| C. | Acetophenone > Benzaldehyde > Benzophenone |
| D. | Benzaldehyde > Acetophenone > Benzophenone |
| Answer» E. | |
| 11. |
Which of the following is least reactive towards a nucleophilic attack? |
| A. | Acetaldehyde |
| B. | Butanone |
| C. | Diisopropyl ketone |
| D. | Ditert-Butyl ketone |
| Answer» E. | |
| 12. |
What is the correct order of reactivity of the following towards nucleophilic addition? |
| A. | Methanal > Ethanal > Acetone |
| B. | Acetone > Ethanal > Methanal |
| C. | Methanal > Acetone > Ethanal |
| D. | Ethanal > Methanal > Acetone |
| Answer» B. Acetone > Ethanal > Methanal | |
| 13. |
The nucleophilic addition reactions of aldehydes are carried out in ________ medium. |
| A. | neutral |
| B. | acidic |
| C. | weakly basic |
| D. | extremely basic |
| Answer» C. weakly basic | |
| 14. |
Which of the following is added to the tetrahedral intermediate when it reacts with a proton from the reaction medium? |
| A. | Nu– |
| B. | H+ |
| C. | Both Nu– and H+ |
| D. | OH– |
| Answer» C. Both Nu– and H+ | |
| 15. |
Aldehydes and ketones undergo __________ reactions. |
| A. | electrophilic addition |
| B. | electrophilic substitution |
| C. | nucleophilic addition |
| D. | nucleophilic substitution |
| Answer» D. nucleophilic substitution | |