Chemistry Chemical Bonding and Molecular Structure Molecular Orbital Theory Single Correct MCQ
Published on: August 12, 2026

Pick out the incorrect statement.

A
N 2 has greater dissociation energy than N 2+
B
O 2 has lower dissociation energy than O 2+
C
Bond length in N 2+ is less than N 2
D
Bond length in NO + is less than in NO.

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Text Solution

Verified by Experts
The correct answer is:
C

N 2 : ( σ 1s) 2 ( σ *1s) 2 ( σ 2s) 2 ( σ *2s) 2 ( π 2p2x = π 2p2y ) (σ 2pz) 2

The bond order of N 2 is 1/2(10 – 4) = 3.

N 2+ : ( σ 1s) 2 ( σ *1s) 2 ( σ 2s) 2 ( σ *2s) 2 ( π 2p2x = π 2p2y ) (σ 2pz) 1

The bond order of N 2+ is 1/2(9 – 4) = 2.5.

O 2 : ( σ 1s) 2 ( σ *1s) 2 ( σ 2s) 2 ( σ *2s) 2 ( σ 2pz) 2 ( π 2p2x = π 2p2y ) ( π *2px1 = π *2p1y)

The bond order of O 2 1/2(10 – 6) = 2.

O 2– : ( σ 1s) 2 ( σ *1s) 2 ( σ 2s) 2 ( σ *2s) 2 ( σ 2pz) 2 ( π 2p2x = π 2p2y ) ( π *2px2 = π *2p1y)

The bond order of O 2 1/2(10 – 7) = 1.5.

NO + derivative of O 2 and isoelectronic with O 22+ ; so ( σ 1s) 2 ( σ *1s) 2 ( σ 2s) 2 ( σ *2s) 2 (σ 2pz) 2 ( π 2p2x = π 2p2y )

The bond order of NO+ 1/2(10 – 4) = 3.

NO derivative of O 2 and isoelectronic with O 2+ ; ( σ 1s) 2 ( σ *1s)2 ( σ 2s) 2 ( σ *2s) 2 (σ 2pz) 2 ( π 2p2x = π 2p2y ), (π *2px) 1

The bond order of NO is 1/2(10 – 5) = 2.5.

bond order 1/bond length ∝ bond dissociation energy.

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