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Question

Among the following species, identify the iso-structural pairs.

NF3, NO3, BF3, H3O+, N3H


A

[] and []

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B

[] and []

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C

[] and []

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D

[] and []

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Solution

The correct option is C

[] and []


Lets first calculate the electron pairs of different compounds.

NF3 central atom N (5 valence electrons)

3 Ligands

ep = (V+L+AC)2=(5+3)2 = 4

The geometry will be tetrahedral [with 3bp and 1 lp]

NO3 Central atom N (5 - valence)

3 Ligands

ep = (V+L+AC)2=(5+3+1)2 [VSEPR is not applied]

Try AVSEPR Theory

ep = (V+L+AC)2=(5+1)2 = 3[ignore oxygen to compute ep]

Geometry is Trigonal Planar.

BF3 Central atom B (3 - valence)

3 Ligands

ep = (V+L+AC)2=(3+3)2 = 3

Geometry is Trigonal planar

H3O+ Central atom 0 (6 - valence)

3 Ligands

Ep = (V+L+AC)2=(6+3+01)2 = 4

Geometry is Tetrahedral N3H Here H cannot be central atom Its structure comes out to be

HN....N....=N [Linear]

Therefore, [NO3 and BF3 are isostructural] and[NF3 and H3O+ are isostructural]


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