Question

Select the correct order of C-O bond order in mixed phosphine carbonyl complex:
i. [Mo(PH₃)3(CO)₃]
ii. [Mo(PH₂PCl)₃(CO)₃]
iii. [Mo(PHPCl₂)3(CO)₃]
a) i < ii < iii
b) iii < ii < i
c) ii < i < iii
d) iii < i < ii