Question

# Among the following species, identify the isostructural pairs. NF3, NO−3, BF3, H3O+

A
[NF3, NO3] and [BF3, H3O+]
B
[NF3, H3O+] and [NO3, BF3]
C
[NF3, H3O+] and [NF3, BF3]
D
None of the above

Solution

## The correct option is B [NF3, H3O+] and [NO−3, BF3]Structure of a molecule can be ascertained by knowing the number of hybrid bonds in the molecule. Thus In NF3: H=12(5+3−0+0)=4 Thus N in NF3 is sp3 hybridised as 4 orbitals are involved in bonding. In NO−3: H=12(5+0−0+1)=3 Thus N in NO−3 is sp2 hybridised as 3 orbitals are involved in bonding. In BF3: H=12(3+3−0+))=3 Thus B in BF3 is sp2 hybridised as 3 orbitals are involved in bonding. In H3O+: H=12(6+3−1+0)=4 Thus O in H3O+ is sp3 hybridised as 4 orbitals are involved in bonding. Thus, isostructural pairs are [NF3, H3O+] and [NO−3, BF3]Chemistry

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