Which of the following pairs are iso-structural ?

C H_{3}^{-} a n d C H_{3}^{+}

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N H_{4}^{+} a n d B H_{4}^{-}

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C H_{4}^{- 2} a n d B F_{3}

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N H_{4}^{+} a n d B e F_{2}

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Solution

The correct option is B $N H_{4}^{+} a n d B H_{4}^{-}$
Correct Option - B.
Reason:- $N H_{4}^{+}$ = $\frac{5 + 1 \times 4 - 1}{2}$ = $\frac{8}{2}$
$= 4$
= $s p^{3}$
$B H_{4}^{-}$ = $\frac{3 + 1 \times 4 + 1}{2}$ = $\frac{8}{2}$
$= 4$
$=$ $s p^{3}$

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