Question:
Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?
Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?
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Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?
Updated On: Apr 15, 2026
- Phenol
- Benzaldehyde
- Butanal
- Benzoic acid
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Aldehydes that do not contain an $\alpha$-hydrogen atom undergo the Cannizzaro reaction when treated with concentrated alkali (50% NaOH).
Step 2: Analysis
Benzaldehyde ($C_{6}H_{5}CHO$) lacks an $\alpha$-hydrogen atom.
Step 3: Reaction
In this disproportionation reaction, one molecule of benzaldehyde is reduced to benzyl alcohol and another is oxidized to sodium benzoate. $$2C_{6}H_{5}CHO + NaOH \rightarrow C_{6}H_{5}CH_{2}OH + C_{6}H_{5}COONa$$
Step 4: Conclusion
Thus, benzaldehyde provides the corresponding alcohol and acid salt.
Final Answer: (B)
Aldehydes that do not contain an $\alpha$-hydrogen atom undergo the Cannizzaro reaction when treated with concentrated alkali (50% NaOH).
Step 2: Analysis
Benzaldehyde ($C_{6}H_{5}CHO$) lacks an $\alpha$-hydrogen atom.
Step 3: Reaction
In this disproportionation reaction, one molecule of benzaldehyde is reduced to benzyl alcohol and another is oxidized to sodium benzoate. $$2C_{6}H_{5}CHO + NaOH \rightarrow C_{6}H_{5}CH_{2}OH + C_{6}H_{5}COONa$$
Step 4: Conclusion
Thus, benzaldehyde provides the corresponding alcohol and acid salt.
Final Answer: (B)
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