Which of the following are isostructural pairs?

A. and
B. and
C. and
D. and

Question

Which of the following are isostructural pairs?

A.  and 
B.  and 
C.  and 
D.  and

Canvas Classes · Accepted Answer

Isostructural = same shape/geometry.

Step 1 — Analyse each pair:

A.  and :
- Both have tetrahedral geometry (4 bonds, 0 lone pairs on central atom) ✓

B.  and :
- Both have tetrahedral geometry (4 bonds, 0 lone pairs) ✓

C.  and :
- : pyramidal (3 bonds + 1 lone pair)
- : trigonal planar (3 bonds + 0 lone pairs)
- Different shapes ✗

D.  and :
- : trigonal planar (3 bonds + 0 lone pairs)
- : T-shaped (3 bonds + 2 lone pairs)
- Different shapes ✗

Isostructural pairs: A and B

Answer: Option (3

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