Question:easy
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?
Show Hint
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
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: Example
$\text{CH}_3\text{CHO}+\text{R'MgX}\rightarrow\text{CH}_3\text{CH(R')OMgX}\xrightarrow{\text{H}_2\text{O}}\text{CH}_3\text{CH(OH)R'}$
Step 2: Identify the product
The product has the carbinol carbon attached to two carbon groups, which is a secondary alcohol.
Step 3: Eliminate
The other three reagents only test for the $-\text{CHO}$ group by oxidising it.
Final Answer:
The reagent is the Grignard reagent. \[ \boxed{\text{(B) }\text{Grignard reagent}} \]
$\text{CH}_3\text{CHO}+\text{R'MgX}\rightarrow\text{CH}_3\text{CH(R')OMgX}\xrightarrow{\text{H}_2\text{O}}\text{CH}_3\text{CH(OH)R'}$
Step 2: Identify the product
The product has the carbinol carbon attached to two carbon groups, which is a secondary alcohol.
Step 3: Eliminate
The other three reagents only test for the $-\text{CHO}$ group by oxidising it.
Final Answer:
The reagent is the Grignard reagent. \[ \boxed{\text{(B) }\text{Grignard reagent}} \]
Was this answer helpful?
0
Top Questions on Chemical Reactions of Aldehydes Ketones and Carboxylic Acids
- The major product formed in the following reaction is-
- JEE Main - 2024
- Chemistry
- Chemical Reactions of Aldehydes Ketones and Carboxylic Acids
- In the following reactions, find the product A and B
- JEE Main - 2024
- Chemistry
- Chemical Reactions of Aldehydes Ketones and Carboxylic Acids
- Select the correct options:
Statement 1: Benzene sulphonyl chloride reacts with 1°, 2° and 3° amines.
Statement 2: All products of the reaction above are soluble in NaOH. - Given below are two statements. one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A:
can be subjected to Wolff-Kishner reduction to give
Reason R: Wolff-Kishner reduction is used to convert
into 
In the light of the above statements, choose the correct answer from the options given below:- JEE Main - 2023
- Chemistry
- Chemical Reactions of Aldehydes Ketones and Carboxylic Acids
- Want to practice more? Try solving extra ecology questions todayView All Questions