Consider the reactions: ​​​​​​​ Identify A , X , Y and Z .

Consider the reactions:
​​​​​​​
Identify A, X, Y and Z.

  1. A - Methoxyymethane, X - Ethanoic acid, Y - Acetate ion, Z - hydrazine.
  2. A - Methoxymethane, X - Ethanol, Y - Ethanoic acid, Z - Semicarbazide.
  3. A - Ethanal, X - Ethanol, Y - But-2-enal, Z - Semicarbazone.
  4. A - Ethanol, X - Acetaldehyde, Y - Butanone, Z - Hydrazone.

Solution

Since 'A' gives positive silver mirror test therefore, it must be an aldehyde or α -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 indicate option (iii).
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Asked in: NEET 2017

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