Question

Cannizzaro reaction is not given by

• A.
• B. $CH_3CHO$
• C. $HCHO$
• D. $2$, $2$-dimethylpropanal

Answer 1

Answer: (B)

$CH_3CHO$

Answer 2

The correct answer is B) $CH_3CHO$

Cannizzaro reaction is not given by Acetaldehyde -****CH3 ​ CHO.

Compounds that lack the presence of α − H undergo a Cannizzaro reaction. The compounds that have an α−H show an aldol reaction.

When treated with an aqueous base CH 3​ CHO does not undergo a Cannizzaro reaction because it has α − H and in the presence of an aqueous base, it undergoes aldol condensation.

1. Benzaldehydehas a benzyl group on α-C. Therefore, it is not the correct answer.
2. In trimethyl acetaldehyde, there are 3-CH3 groups attached to the α C. So, it will give Cannizzaro reaction.
3. In formaldehyde, there is no α-C, hence it is the wrong answer.
4. In the case of 2,2,2-dimethyl propanal, it contains three methyl groups attached to the carbonyl carbon. Therefore, this is also not the correct answer.

Therefore, option B is the correct answer.

Discover More From Chapter:Aldehydes, Ketones, and Carboxylic Acids