Chemistry Aldehydes & Ketones PMDC 2020
PMDC Verified Question 51 of 94
Secondary alcohol is the product of reduction of which carbonyl compound?
A
\( H_3C-CHO \)
B
\( H_3C-CO-CH_3 \)
C
\( HCHO \)
D
\( H_3C-CH_2-CHO \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( H_3C-CO-CH_3 \)
Concept:

Reduction involves the addition of hydrogen across the carbonyl (\( C=O \)) double bond.

Solution:

  • When an aldehyde (\( R-CHO \)) is reduced, it forms a primary alcohol (\( R-CH_2OH \)).


  • When a ketone (\( R-CO-R' \)) is reduced, it forms a secondary alcohol (\( R-CH(OH)-R' \)).


  • Option B is Acetone (\( CH_3-CO-CH_3 \)), a ketone. Upon reduction, it yields 2-propanol, which is a secondary alcohol.


Why other options are incorrect:

Options A (acetaldehyde), C (formaldehyde), and D (propanal) are all aldehydes. Their reduction yields primary alcohols (ethanol, methanol, and 1-propanol, respectively).

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