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Question

Which of the following species contains equal number of σ and π bonds?
(AIPMT - 2015)

A
HCO3
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B
(CN)2
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C
XeO4
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D
CH2(CN)2
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Solution

The correct option is C XeO4
Each double bond has one σ and one π bond. Each triple bond contains one σ and two π bonds.


The number of σ and π bonds are given below:
Molecule Number of σ bonds Number of π bonds
XeO4 4 4
(CN)2 3 4
CH2(CN)2 6 4
HCO3 4 1

Thus, XeO4 contains equal number of σ and π bonds.

Hence, option (a) is correct.

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