Q25 · CSIR NET Chemistry, June 2021
Paper: CSIR NET June 2021 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: IR · Marks: 2 · Difficulty: Hard
The correct order of $C=O$ stretching frequency in IR spectrum for the following compound is 
A 
B 
C
A B C(a)A $>$ C $>$ B
(b)B $>$ C $>$ A
(c)C $>$ B $>$ A
(d)B $>$ A $>$ C
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
An equatorial α-Cl, eclipsing the C=O, raises ν(C=O) most through a field effect (C). An axial α-Cl (B) raises it slightly. C > B > A (c).
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