question_answer

Compound A undergoes formation of cyanohydrin which on hydrolysis gives lactic acid\[(C{{H}_{3}}CHOHCOOH)\]. Therefore, compound A is

A)  formaldehyde    

B)  acetaldehyde

C)  acetone          

D)  benzaldehyde

Correct Answer: B

Solution :

Since, compound A gives cyanohydrin, it must contain a carbonyl compound. Thus, its general formula should be The other attached group to the carbon in the product (ie, lactic acid) are \[C{{H}_{3}}\] and H. On attaching these groups, we get This is the formula of compound A. Thus, compound A is acetaldehyde.