Question:
Which of the following reagents, when reacted with aldehydes other than formaldehyde, forms secondary alcohols?
Which of the following reagents, when reacted with aldehydes other than formaldehyde, forms secondary alcohols?
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Grignard reagents add to the carbonyl group and give an alcohol after hydrolysis, with formaldehyde giving a primary alcohol.
Updated On: Nov 12, 2026
- Tollen's reagent
- Grignard reagent
- Fehling's reagent
- Schiff's reagent
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
A Grignard reagent \(\text{RMgX}\) adds to the \(\text{C=O}\) group to form an alkoxide, which on hydrolysis gives an alcohol.
Step 2: Product with different carbonyls
Formaldehyde gives a primary alcohol, other aldehydes give secondary alcohols and ketones give tertiary alcohols.
Step 3: Check the other reagents
Tollen's, Fehling's and Schiff's reagents are used to test for aldehydes and do not form alcohols.
Final Answer:
Grignard reagent gives secondary alcohols with aldehydes other than formaldehyde. \[ \boxed{\text{(B) }\text{Grignard reagent}} \]
A Grignard reagent \(\text{RMgX}\) adds to the \(\text{C=O}\) group to form an alkoxide, which on hydrolysis gives an alcohol.
Step 2: Product with different carbonyls
Formaldehyde gives a primary alcohol, other aldehydes give secondary alcohols and ketones give tertiary alcohols.
Step 3: Check the other reagents
Tollen's, Fehling's and Schiff's reagents are used to test for aldehydes and do not form alcohols.
Final Answer:
Grignard reagent gives secondary alcohols with aldehydes other than formaldehyde. \[ \boxed{\text{(B) }\text{Grignard reagent}} \]
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