Q38 · CSIR NET Chemistry, December 2011
Paper: CSIR NET December 2011 · Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: Hydrogen Bonding Weak Interactions · Marks: 2 · Difficulty: Medium
The number of anti-bonding electrons in NO and CO according to MO theory are respectively.
(a)1,0
(b)2,2
(c)3,2
(d)2,3
Answer
Answer: C ✓ checked by 4AB · confidence medium
The source book printed A; on checking, C is correct — see the explanation.
Explanation
Counting all antibonding MOs: CO has σ*(2s)² = 2 antibonding electrons; NO has σ*(2s)² plus one in π* = 3. Hence 3 and 2.
Study loop for Chemical Bonding