Class 12 Chemistry
Magical Series Assignment
Organic Reasoning – Set 3
Write the reasons for the following …
Q.1. Carboxylic acids do not give characteristic reactions of the carbonyl group.
Q.2. Ethanoic acid is a weaker acid than benzoic acid.
Q.3. Monochloroethanoic acid has a higher pKa value than dichloroethanoic acid.
Q.4. Electrophilic substitution in benzoic acid takes place at meta position.
Q.5. Ester hydrolysis is slow in the beginning and becomes faster after some time.
Q.6. Chloroacetic acid is stronger than acetic acid.
Q.7. pH of reaction should be carefully controlled while preparing ammonia derivatives of carbonyl compounds.
Q.8. Aldehydes and ketones have lower boiling points than the corresponding alcohols.
Q.9. The boiling points of aldehydes and ketones are lower than that of the corresponding carboxylic acid.
Q.10. Ethanal is soluble in water.
Q.11. Aldehydes and ketones undergo a number of addition reactions.
Q.12. Aldehydes are more reactive than ketones towards nucleophiles.
Q.13. Cyclohexanone forms cyanohydrin in good yield but 2, 4, 6- tri-methylcyclohexanone does not.
Q.14. Formaldehyde does not take part in aldol condensation.
Q.15. There are two –NH2 groups in semi carbazide. However, only one such group is involved in the formation of semicarbazones.
Q.16. Ethanamide (CH3CONH2) is a weaker base than ethanamine (CH3CH2NH2).
Q.17. Gabriel phthalimide is preferred for synthesizing primary amines.
Q.18. Primary aromatic amines cannot be prepared by Gabriel phthalimide, synthesis.
Q.19. Silver chloride dissolves in methylamine solution.
Q.20. Electrophilic substitution in ease of aromatic amines takes place more readily than benzene.
Q.21. Aniline does not undergo Friedel-Craft reaction.
Q.22. Diazonium salts of aromatic amines are more stable than those of aliphatic amines.
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