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Question

Which of the following has highest value for bond order −C6H6,CO2−3,NO− and SO3?

A
C6H6
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B
CO23
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C
NO
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D
SO3
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Solution

The correct option is D NO
Bond order (BO) can be calculated using following methods:
(i) BO=TotalnumberofbondsassociatedwiththecentralatomNumberofσbondsassociatedwiththecentralatom
(or)
BO=TotalnumberofbondsbetweentwoatomsTotalnumberofresonancestructures
(ii) BO=NumberofbondingelectronsNumberofantibondingelectrons2
We use both the concepts as per situation.
Thus,
(i) We use concept (i) for the species C6H6,CO23 and SO3 and concept (ii) for NO
On the basis of concept (ii)
BO of NO=7+8+1
=16 electrons
BO for NO=1062=2
Hence, highest value for BO is of NO.
735026_678506_ans_16cea439f0fb49a99fd2701db0d86f1c.png

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