question_answer

Reaction of acetaldehyde with \[HCN\] followed by hydrolysis gives a compound which shows           

A)  optical isomerism

B)  geometrical isomerism

C)  metamerism

D)  tautomerism                                 

Correct Answer: A

Solution :

All the four valencies of \[{{C}^{*}}\] (chiral atom) in lactic acid are attached with different groups or atoms hence, it is optically active.                 \[\underset{Iactic\,acid}{\mathop{H{{-}^{*}}\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{\overset{COOH}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-OH}}\,\]