Question:
Which among the following functional groups is reduced by diborane?
Which among the following functional groups is reduced by diborane?
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Diborane is an electrophilic reducing agent that reduces carboxylic acids readily without touching groups like nitro or halide.
Updated On: Nov 13, 2026
- -COOR
- -COOH
- \(-\mathrm{NO}_{2}\)
- -X
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Diborane (\(\text{B}_2\text{H}_6\)) is an electrophilic reducing agent. It attacks electron rich groups, and a carboxylic acid reacts fastest.
Step 2: Reaction
\(\text{RCOOH} \xrightarrow{\text{B}_2\text{H}_6/\text{THF},\ \text{H}_2\text{O}} \text{RCH}_2\text{OH}\)
Step 3: Compare the options
Diborane reduces \(-\text{COOH}\) selectively. It does not reduce \(-\text{NO}_2\) or alkyl halide groups, and esters react much more slowly.
Final Answer:
The carboxylic acid group \(-\text{COOH}\) is reduced by diborane. \[ \boxed{\text{(B) }-\text{COOH}} \]
Diborane (\(\text{B}_2\text{H}_6\)) is an electrophilic reducing agent. It attacks electron rich groups, and a carboxylic acid reacts fastest.
Step 2: Reaction
\(\text{RCOOH} \xrightarrow{\text{B}_2\text{H}_6/\text{THF},\ \text{H}_2\text{O}} \text{RCH}_2\text{OH}\)
Step 3: Compare the options
Diborane reduces \(-\text{COOH}\) selectively. It does not reduce \(-\text{NO}_2\) or alkyl halide groups, and esters react much more slowly.
Final Answer:
The carboxylic acid group \(-\text{COOH}\) is reduced by diborane. \[ \boxed{\text{(B) }-\text{COOH}} \]
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