Consider the reactions :

Identify A, X, Y and Z

Options

A. A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone
B. A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine
C. A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide
D. A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone

Answer

D

Explanation

`underset((X))(CH_(3)CH_(2)OH) underset(573 K)overset(Cu)(rarr) underset((A))(CH_(2) - overset(O)overset(||)(C) - H)`
`underset((A))(CH_(3) - overset(O)overset(||)(C) - H) overset(-OH Delta)(rarr) CH_(3) - underset(Y)(CH) = CH - overset(O)overset(||)(C) - H`
`CH_(3) - underset((A))overset(O)overset(||)(C) - H overset(NH_(3) - NH - overset(O)overset(||)(C) - NH_(3))(rarr) CH_(3) - CH = underset((Z))(N) - NH - overset(O)overset(||)(C) - NH_(3)`
`therefore` It is a substitution reaction.