Find out the bond order of :

Chemistry Chemical Bonding and Molecular Structure Molecular Orbital Theory Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

H 2

H 2 +

He 2

Li 2 (e) Be 2 (f) B 2

Text Solution

Verified by Experts

The correct answer is:

1 1/2 0 1 (e) 0 (f) 1

Hydrogen molecule (H 2 ) : H 2 : ( σ 1s) 2

Its bond order, therefore, is =

Cation of hydrogen molecule (H 2 + ) : H 2 + : ( σ 1s) 1

Its bond order, therefore, is = 1/2 (1 – 0) = 1/2

Helium molecule (He 2 ) : He 2 : ( σ 1s) 2 ( σ *1s) 2

Its bond order, therefore, is ½(2 – 2) = 0

Lithium molecule (Li 2 ) : ( σ 1s) 2 ( σ *1s) 2 ( σ 2s) 2

Its bond order, therefore, is 1/2(4 – 2) = 1.

(e) Beryllium (Be 2 ) : ( σ 1s) 2 ( σ *1s) 2 ( σ 2s) 2 ( σ *2s) 2

Its bond order, therefore, is 1/2(4 – 4) = 0.

(f) Boron (B 2 ) : ( σ 1s) 2 ( σ *1s) 2 ( σ 2s) 2 ( σ *2s) 2 ( π 2p 1 x = π 2p 1 y ) ( σ p z ) 0 Its bond order, therefore, is 1/2(6 – 4) = 1.

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