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Question

The decreasing order of NO bond lengths in NO+2, NO2 and NO3 is:

A
NO3>NO+2>NO2
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B
NO3>NO2>NO+2
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C
NO+2>NO3>NO2
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D
NO2>NO3>NO+2
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Solution

The correct option is B NO3>NO2>NO+2
By finding out the bond order of the molecules, we can predict the bond length order.
For NO+2,
B.O=2
Bond order=No. of bondsNo. of resonating structures,
For NO2,
B.O=32=1.5
For NO3,
B.O=43=1.33
The order of bond order is:
NO+2>NO2>NO3
Bond order1Bond length
Thus, the order of bond length is just reverse.

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