Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali ?

Options

A. `C_6H_5CHO`
B. `CH_3CH_2CHO`
C. `CH-=C-CHO`
D. `CH_2=CH-CHO`

Answer

B

Explanation

`CH_3CH_2CHO` has two `alpha` - hydrogen atoms so it can undergo self aldol condensation in presence of cold dilute alkali.
`CH_3-CH_2CHO+CH_3-CH_2CHO underset("alkali")overset("dil")to underset("4-hydroxy hexanal")(CH_2-CH_2 -underset(OH)underset(|)(CH)-CH_2-CH_2-CHO)`