Question:
Which of the following compounds will not undergo aldol condensation?
Which of the following compounds will not undergo aldol condensation?
Show Hint
Aldol condensation requires at least one $\alpha$-hydrogen.
Compounds that do not possess $\alpha$-hydrogen such as:
\[
\mathrm{HCHO,\ C_6H_5CHO}
\]
cannot undergo aldol condensation.
Updated On: Jun 17, 2026
- $\mathrm{CH_3CHO}$
- $\mathrm{CH_3COCH_3}$
- $\mathrm{HCHO}$
- $\mathrm{CH_3CH_2CHO}$
Show Solution
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The Correct Option is C
Solution and Explanation
Concept:
Aldol condensation is shown by aldehydes and ketones containing at least one $\alpha$-hydrogen atom. The reaction proceeds through the formation of an enolate ion or enol intermediate.
Compounds lacking $\alpha$-hydrogen cannot undergo aldol condensation.
Step 1: Examine acetaldehyde. \[ \mathrm{CH_3CHO} \] contains $\alpha$-hydrogen atoms. Hence it undergoes aldol condensation.
Step 2: Examine acetone. \[ \mathrm{CH_3COCH_3} \] contains several $\alpha$-hydrogen atoms. Hence it undergoes aldol condensation.
Step 3: Examine formaldehyde. \[ \mathrm{HCHO} \] has no carbon atom adjacent to the carbonyl carbon. Therefore it has no $\alpha$-hydrogen. Hence aldol condensation is not possible.
Step 4: Examine propanal. \[ \mathrm{CH_3CH_2CHO} \] contains $\alpha$-hydrogen atoms and undergoes aldol condensation.
Step 5: Final conclusion. The compound that does not undergo aldol condensation is \[ \mathrm{HCHO}. \] Therefore, \[ \boxed{\text{Option (3)}} \]
Step 1: Examine acetaldehyde. \[ \mathrm{CH_3CHO} \] contains $\alpha$-hydrogen atoms. Hence it undergoes aldol condensation.
Step 2: Examine acetone. \[ \mathrm{CH_3COCH_3} \] contains several $\alpha$-hydrogen atoms. Hence it undergoes aldol condensation.
Step 3: Examine formaldehyde. \[ \mathrm{HCHO} \] has no carbon atom adjacent to the carbonyl carbon. Therefore it has no $\alpha$-hydrogen. Hence aldol condensation is not possible.
Step 4: Examine propanal. \[ \mathrm{CH_3CH_2CHO} \] contains $\alpha$-hydrogen atoms and undergoes aldol condensation.
Step 5: Final conclusion. The compound that does not undergo aldol condensation is \[ \mathrm{HCHO}. \] Therefore, \[ \boxed{\text{Option (3)}} \]
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