Draw the structure of semicarbozide of ethanal.

Explanation

Reaction occurs through the more nucleophilic `NH_(2)` (attached to NH) and not through `NH_(2)` attached CO group. Thus,
`underset("Ethanol")(CH_(3)-CH=O)+underset("Semicarbozide")(H_(2)N NHCOCH_(2)) overset(pH" "3.5)to underset("Ethanal semicarbazone")(CH_(3)-CH=N NHCOCH_(2))+H_(2)O`