Aromatic Aldehydes Ketones and Acids - Result Question 9
####11. The major product formed in the following reaction is
(a)
(b)
(c)
(d)
(2019)
Show Answer
Answer:
Correct Answer: 11. (c)
Solution:
- In aldol condensation, generally aldehydes react at a faster rate than ketones towards base. In the given case $CH _3 CHO$ will lose $\alpha$-hydrogen faster than $\bigcirc$ reason, i.e. conjugation between benzene ring and $>C=O$ group. Along with sterically less hindered nucleophile of $CH _3 CHO$ will also add to the major product formation.
Following four products are possible in the reaction:
$O H$ of base will prefer to attack on $-CH _3$ group of $CH _3 CHO$ for the formation of carbanion and as among the $>C=O$ groups available, the $>C=O$ group of $CH _3 CHO$ is the best carbanion acceptor. Hence, self condensation product of $CH _3 CHO$ will be the major product.
