Benzene diazonium chloride undergoes Sandmeyer reaction in presence of
Cu2Cl2 while undergoes Gattermann reaction in presence of
Cu∕HCl to give chlorobenzene along with nitrogen gas
(N2).
So, (A) - (ii) Sandmeyer reaction
(B) - (iv) Gattermann reaction
(C) Ethyl chloride reacts with sodium in presence of dry ether to give
n-butane. This reaction is known as Wurtz reaction.
| 2CH3CH2Cl |
| Ethyl‌chloride[Aliphatic‌1∘‌halide] |
+2Na| CH3CH2−CH2CH3 |
| n−butane |
+2NaCl It is Wurtz reaction in which an aliphatic
1∘ or
2∘ halides produces a symmetrical alkane like
n-butane.
(D) Chlorobenzene reacts with sodium in presence of dry ether to give biphenyl. This is known as Fittig reaction.
It is Fittig reaction in which a halobenzene produces biphenyl.
So,
C - (i) Wurtz reaction
D - (iii) Fittig reaction
So, correct match is A-(ii), B-(iv), C-(i) and D-(iii).