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