1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the reactions :- Identify A, X, Y and Z

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Q. Consider the reactions :-
Identify $A, X, Y$ and $Z$Chemistry Question Image

NEETNEET 2017Aldehydes Ketones and Carboxylic Acids

Solution:

Since 'A' gives positive silver mirror test therefore, it must be an aldehyde or $\alpha$

Hydroxyketone.

Reaction with semicarbazide indicates that A can be an aldehyde or ketone.

Reaction with $OH ^{-}$ i.e., aldol condensation (by assuming alkali to be dilute) indicates that $A$ is aldehyde as aldol reaction of ketones is reversible and carried out in special apparatus.

These indicates option (2).

$\underset{(X)}{CH _{3}- CH _{2} OH}\xrightarrow[{573\,K}]{{Cu}} \underset{(A)}{CH_3 -CHO} \xrightarrow[{\Delta}]{(Ag(NH_3)_2)^+,OH^-} CH_3 -COOH$

Solution Image