Assertion (A): PH₃ & BF₃ both are electron deficient molecule.
Reason (R): All P-H bond length are indentical in PH₃ and all B-F bond length are also identical in BF₃.

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Assertion (A) is false and Reason (R) is true.

Assertion (A) is true and Reason (R) is false.

Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).

Both Assertion (A) and Reason (R) are the true but Reason (R) is not a correct explanation of Assertion (A).

answer is D.

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Detailed Solution

Boron in BF₃ has an unfilled orbital and is electron-deficient molecule whereas PH₃ is an electron-rich compound, nevertheless, it is not an electron-deficient molecule.

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