A mixture of bromobenzene and 1-bromo-4-methylbenzene (1 : 1) is treated with sodium in dry ether (Fittig reaction). Counting only the aromatic coupling products, the number of different compounds formed (biaryls) is

Answer: C

Two aryl radicals/organosodium species can combine in three ways:

Ph - Ph

(biphenyl),

4 - CH X_{3} C X_{6} H X_{4} - C X_{6} H X_{4} - 4 - CH X_{3}

(4,4

^{'}

-dimethylbiphenyl) and the cross product

4 - CH X_{3} C X_{6} H X_{4} - C X_{6} H X_{5}

(4-methylbiphenyl). Hence 3.