Question

$\ce{CH3CHO + HCHO ->[Dil.\, NaOH][\text{Heat}] A }$
$\ce{->[HCN][H_3O^+] B}$
The structure of the compound $B$ is

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

$CH_3CHO+HCHO \ce{ ->[{dil.NaOH}][{\text{cross aldol condensethem}}] }$

$\underset{\text{3-hydroxy propanal}}{{HOCH_2-CH_2-CHO}}$

$\ce{ ->[{\text{Heat}}][{-H_2O}] }\underset{\text{prop-2-enal (A)}}{{CH_2=CH-CHO}}$

$\ce{ ->[{HCN}][{\text{1, 2, addition}}] }$