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Question: Which of the following option with respect to increasing bond dissociation energies is correct ?...

Which of the following option with respect to increasing bond dissociation energies is correct ?

A

NO < C2< O2–< He2+

B

C2< NO < He2+ < O2–

C

He2+< O2–< NO < C2

D

He2+ < O2–< C2< NO

Answer

He2+ < O2–< C2< NO

Explanation

Solution

He2+ bond order = 2−12=12\frac{2 - 1}{2} = \frac{1}{2};

O2– bond order =10−72=1.5\frac{10 - 7}{2} = 1.5

C2 bond order = 8−42=2\frac{8 - 4}{2} = 2 ;

NO bond order = 10−52=2.5\frac{10 - 5}{2} = 2.5

Bond order bond dissociation energy.