Assertion : $P F_{5}$ and $B r F_{5}$ appear to have similar formulae, but structures are different. Reason: $P F_{5} : s p^{3} d$ trigonal bipyramidal, $B r F_{5} s p^{3} d^{2}$ square based pyramid.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
${P F}_{5}$ had $5$ bond pairs only. There fore: ${s p}^{3} d$ hybridized.
${B r F}_{5}$ has $5$ bond pairs and $1$ lone pair. Therefore: ${s p}^{3} d^{2}$ .
Hence, the structures are different.

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