question_answer

Cannizaro reaction is not given by

A)  methanal

B)  phenyl methanal

C)  2, 2-dimethyl butanal

D)  phenyl ethanol

Correct Answer: D

Solution :

 Only those aldehydes in which \[\alpha -\]hydrogen atoms are not present, give Cannizaro reaction. The structure of the given compounds is [a] \[\underset{\begin{smallmatrix}  \text{methanal} \\  (no\,\alpha -H) \end{smallmatrix}}{\mathop{HCHO}}\,\] [b] [c] [d] Thus, phenyl ethanal because of the presence of \[\alpha -H\]atoms, does not give Cannizaro reaction.