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Chemistry Question on Aldehydes, Ketones and Carboxylic Acids

Aldol condensation would not occur in

A

CH3COCH3C{{H}_{3}}COC{{H}_{3}}

B

CH3CH2CHOC{{H}_{3}}C{{H}_{2}}CHO

C

HCHOHCHO

D

CH3CHOC{{H}_{3}}CHO

Answer

HCHOHCHO

Explanation

Solution

Aldol condensation is shown by only those carbonyl compounds which have α−\alpha - hydrogen atoms. CαH3−CO∣∣−CαH3(a)   CH3CαH2CHO(b)   CαH3CHO(d)\underset{(a)}{\overset{\alpha}{C}H_3-\overset{\underset{||}{O}}{C}-\overset{\alpha}{C}H_3} \,\,\, \underset{(b)}{CH_3\overset{\alpha}{C}H_2CHO}\,\,\, \underset{(d)}{\overset{\alpha}{C}H_3CHO} Thus, compounds given in choice (a),(b)(a),(b) and (d)(d) would undergo aldol condensation because they have α−\alpha - hydrogen atoms. H−CO∣∣−HH -\overset{\underset{||}{O}}{C}-H however, will not give aldol condensation because it does not have α−\alpha - hydrogen atom.