CGPET 2015 Solved Paper

Bond length ∞

1

Bond‌order

Bond order in CO = 3 (By molecular orbital theory)
Bond order in CO2
=

Number‌of‌bonds‌in‌all‌possible‌sides

Number‌of‌resonating‌structure

=

4

3

=2
Bond order in CO32−=

4

3

=1.33
∴ Order of bond length is CO32−<CO2<CO
So, order of bond length of C−O will be CO<CO2<CO32−