Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Aldehydes, Ketones and Carboxylic Acids

Short Answer Type

321.

Explain the mechanism of aldol condensation using ethanal as an example.

196 Views

322.

Account for the following:
Carboxylic acids with five or less carbons are water soluble, but many with six or more carbons dissolves in alcohols.

174 Views

323.

Account for the following:
Carboxylic acids exist as dimers in the vapour phase.

184 Views

324. Illustrate the mechanism of reaction of carbonyl group with an ammonia derivative, H₂N—Z.

217 Views

325. Account for the fact that the C—O bond in RCOOH is shorter than in ROH ?

560 Views

326. Compare the reactivities of the C = O in RCOOH and RCHO towards nucleophiles.

The C=O in RCOOH is less reactive towards nucleophillic reaction. Due to resonance, there is less positive charge on the C = O carbon in RCOOH. As a result the bond cleavage in RCOOH is diffcult towards nucleophiles.

225 Views

Long Answer Type

327. Why is benzoic acid a stronger acid than phenol?

645 Views

Short Answer Type

328. Write equation for the ionization of RCOOH and for K_a and then explain why RCOOH has a lower pKa value than alcohol.

151 Views

329. Account for the following acidic strength order:

FCH subscript 2 COOH space space space space space greater than space space space space ClCH subscript 2 COOH space space space greater than space space BrCH subscript 2 COOH space space greater than space space ICH subscript 2 COOH space greater than space CH subscript 3 COOH

163 Views

330. Account for the following acidic strength order:

Cl subscript 3 straight C space COOH greater than space Cl subscript 2 CHCOOH greater than ClCH subscript 2 COOH space greater than CH subscript 3 COOH

154 Views