Among the following the pair in which the two species are not isostructural is:

S i F_{4}

and

S F_{4}

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I O_{3}^{-}

and

X e O_{3}

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B H_{4}^{-}

and

N H_{4}^{+}

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P F_{6}^{-}

and

S F_{6}

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Solution

The correct option is D $S i F_{4}$ and $S F_{4}$
In each of the given options, both the molecules have the same number of bond pairs. If there will be a difference in the number of lone pairs then the two would be structurally different.
Since, they have same number of bond pairs we just need to check the total valence electrons around the central atoms.
(i) $S i F_{4}$ $S F_{4}$
$T V E = 8$ $T V E = 10$
Unequal
(ii) ${I O}_{3}^{-}$ $X e O_{3}$
$T V E = 14$ $T V E = 14$
Equal
(iii) ${B H}_{4}^{-}$ $T V E = 8$
${N H}_{4}^{+}$ $T V E = 8$
Equal
(iv) ${P F}_{6}^{-}$ $T V E = 12$
${S F}_{6}$ $T V E = 12$
Equal
$∴$ $S i O_{4}$ is not isostructural with $S F_{4}$

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Question 01

Isostructural species are those which have the same shape and hybridisation. Among the given species identify the isostructural pairs.

(a) $[N F_{3} a n d B F_{3}]$

(b) $[B F_{4}^{-} a n d N H_{4}^{+}]$

(d) $[N H_{3} a n d N O_{3}^{-}]$

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

N F_{3}, N O_{3}^{-}, B F_{3}, H_{3} O^{+}, H N_{3}

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