Chemistry Aldehydes & Ketones ETEA 2023
PMDC Verified Question 20 of 94
Aldehyde and ketone on reaction with hydroxylamine form:
A
Hydrazine
B
Hydrazone
C
Oxime
D
Imine
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Oxime
Concept:

Ammonia derivatives (\( NH_2-G \)) react with carbonyl compounds via nucleophilic addition-elimination to form \( C=N-G \) double bonds.

Formula:

$$ >C=O + H_2N-OH \longrightarrow >C=N-OH + H_2O $$

Solution:

  • The reagent is hydroxylamine (\( NH_2-OH \)), where the 'G' group is a hydroxyl (\( -OH \)).


  • During the condensation reaction, water is eliminated.


  • The resulting structural motif containing a carbon-nitrogen double bond attached to an oxygen (\( >C=N-OH \)) is specifically classed as an Oxime.


Why other options are incorrect:

Hydrazones are formed by reacting with hydrazine (\( NH_2-NH_2 \)). Imines are formed by reacting with primary alkylamines (\( R-NH_2 \)). Hydrazine is a reagent, not a product.

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