Assertion : $P C l_{5}$ and $P C l_{4}$ are thermally unstable Reason: They produce same gas on thermal decomposition

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
They both are thermally unstable as they are easily oxidisable substance.

$P C l_{5} \to P C l_{3} + C l_{2}$

$P C l_{4} \to P C l_{2} + C l_{2}$

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

Hence, the correct option is $B$

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