Haloalkanes and Haloarenes Part 1

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

‌ Ether ‌

⟶

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).