MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Phenylmethanamine is more basic than benzenamine. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
If the pKb value of p-nitroaniline is 13, predict the pKb value of its ortho isomer? |
| A. | 9.38 |
| B. | 11.54 |
| C. | 13 |
| D. | 14.22 |
| Answer» E. | |
| 3. |
If a is the pKb value of aniline and b , c and d are the pKb values of o-, m- and p- isomers of methylaniline respectively, what is the correct order of the values a, b, c and d? |
| A. | a > b > c > d |
| B. | d > c > a > b |
| C. | d > c > b > a |
| D. | b > a > c > d |
| Answer» E. | |
| 4. |
Identify the correct order of basic strength of the following substituted anilines? |
| A. | p-Methylaniline > m-Methylaniline > p-Nitroaniline > m-Nitroaniline |
| B. | p-Methylaniline > m-Methylaniline > m-Nitroaniline > p-Nitroaniline |
| C. | p-Nitroaniline > m-Nitroaniline > p-Methylaniline > m-Methylaniline |
| D. | p-Nitroaniline > m-Nitroaniline > m-Methylaniline > p-Methylaniline |
| Answer» C. p-Nitroaniline > m-Nitroaniline > p-Methylaniline > m-Methylaniline | |
| 5. |
Which of the following will have the highest pKb value? |
| A. | C<sub>6</sub>H<sub>5</sub>NH<sub>2</sub> |
| B. | p-C<sub>6</sub>H<sub>5</sub>(CH<sub>3</sub>)NH<sub>2</sub> |
| C. | p-C<sub>6</sub>H<sub>5</sub>(OCH<sub>3</sub>)NH<sub>2</sub> |
| D. | p-C<sub>6</sub>H<sub>5</sub>(NH<sub>2</sub>)NH<sub>2</sub> |
| Answer» B. p-C<sub>6</sub>H<sub>5</sub>(CH<sub>3</sub>)NH<sub>2</sub> | |
| 6. |
Which of the following is the least basic amine? |
| A. | p-Bromoaniline |
| B. | p-Chloroaniline |
| C. | p-Nitroaniline |
| D. | p-Aminobenzonitrile |
| Answer» D. p-Aminobenzonitrile | |
| 7. |
4-Aminobenzoic acid has a lower pKa value compared to aniline. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Which of the following groups when present at para position increases the basic strength of aniline? |
| A. | NO<sub>2</sub> |
| B. | Br |
| C. | NH<sub>2</sub> |
| D. | COOH |
| Answer» D. COOH | |
| 9. |
How many more resonating structures does aniline have than anilinium ion? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 10. |
Which of the following amines will be most reactive when treated with HCl? |
| A. | N-Methylmethanamine |
| B. | N,N-Dimethylmethanamine |
| C. | N-Ethylethanamine |
| D. | N,N-Diethylethanamine |
| Answer» D. N,N-Diethylethanamine | |
| 11. |
Which of the following aromatic amines has lower pKb value than ammonia? |
| A. | Benzylamine |
| B. | Benzenamine |
| C. | N-Methylbenzenamine |
| D. | N,N-Dimethylbenzenamine |
| Answer» B. Benzenamine | |
| 12. |
If the pKb value of N,N-diethylethanamine is 3.25, predict the pKb value of ethanamine. |
| A. | 3.00 |
| B. | 3.29 |
| C. | 4.75 |
| D. | 9.38 |
| Answer» C. 4.75 | |
| 13. |
What is the correct order of basic strength of the following ethyl substituted amines in aqueous solution? (R=ethyl group) |
| A. | RNH<sub>2</sub> > R<sub>2</sub>NH > R<sub>3</sub>N |
| B. | R<sub>2</sub>NH > R<sub>3</sub>N > RNH<sub>2</sub> |
| C. | R<sub>3</sub>N > R<sub>2</sub>NH > RNH<sub>2</sub> |
| D. | R<sub>2</sub>NH > RNH<sub>2</sub> > R<sub>3</sub>N |
| Answer» C. R<sub>3</sub>N > R<sub>2</sub>NH > RNH<sub>2</sub> | |
| 14. |
If p, q and r are the pKb values of methylamine, N-methylamine and N,N-dimethylamine respectively, what is the correct order of p, q and r? |
| A. | p > q > r |
| B. | r > q > p |
| C. | q > p > r |
| D. | r > p > q |
| Answer» E. | |