Question

What is the product of the following reaction?
Hex-3-ynal + (i) NaBH\(_4\), (ii) Pb\(_3\), (iii) Mg/ether, (iv) CO\(_2\)/H\(_2\)O → ?

• A. A
• B. B
• C. C
• D. D

Hint:

Grignard reagents react with CO\(_2\) to form carboxylic acids, and NaBH\(_4\) reduces aldehydes to alcohols.

Answer 1

The Correct Option is D

Step 1: Understand the reagents.
- NaBH\(_4\) reduces the aldehyde group to a primary alcohol. - Pb\(_3\) is involved in the formation of a reaction intermediate. - Mg/ether helps in Grignard reagent formation. - CO\(_2\)/H\(_2\)O introduces a carboxyl group, forming a carboxylic acid.

Step 2: Final product.
The final product after these reactions is COOH (carboxylic acid).