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Question

Select the correct statement(s) about the compound NO[BF4] :


A
It has 5σ and 2π bonds
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B
Nitrogen-Oxygen bond length in given compound is higher than in nitric oxide (NO)
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C
It is a diamagnetic species
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D
BF4 and BF3 both are lewis acids
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Solution

The correct options are
A It has 5σ and 2π bonds
C It is a diamagnetic species
Given compound is : [NO]+[BF4]
We know that number of σ bonds in [BF4]4.
As per MOT, Bond order of  [NO]+ is 3, which means there is triple bond between N & O i.e., one σ and two π bonds.
Hence, overall count of σ bonds are 5 and π bonds are 2.
option (A) is correct.

Also, as per MOT, Bond order of  [NO] is 2.5 and we know that bond order is inversely proportional to bond length. Hence nitrogen-oxygen bond length in NO is higher than [NO]+.
option (B) is incorrect.

Both [NO]+ and [BF4] are diamagnetic individually hence overall compound is also diamagnetic.
option (C) is correct.

[BF4] is not a lewis acid because its octet is complete whereas in BF3 although its octet is not complete but due to presence of pπ  pπ back bonding there is partial completion of octet hence it is a weak lewis acid. 
  option (D) is incorrect.


 

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