Benzophenone can be obtained by:
a.  Benzoyl chloride + Benzene 
b.  Benzoyl chloride + Diphenyl cadmium
c.  Benzoyl chloride + Phenyl magnesium chloride
d.  Benzene + Carbon monoxide 

Choose the correct option

1. (a, b) 2. (b, c)
3. (c, d) 4. (a, d)

Benzophenone can be obtained by Friedel-Craft acylation reaction. The reaction is shown as