JEE Main Chemistry question

In which of the following pairs are the two species not isostructural?

(A) and
(B) and Correct
(C) and
(D) and

Answer: (B)

Solution

has 5 bond pairs and no lone pair (), giving a trigonal bipyramidal shape, while has 5 bond pairs plus 1 lone pair (), giving a square pyramidal shape — these are not isostructural.

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Question ID VK-133720