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Question

Assertion :N(CH3)3 is pyramidal but N(SiH3)3 is planar. Reason: In N(CH3)3, lone pair on N remains on it causing lp−bp repulsion while in N(SiH3)3, lone pair is transferred to vacant d-orbital of Si.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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
N(CH3)3 has sp3 hybridization on nitrogen with pyramidal shape due to pπpπ bonding. Whereas in N(SiH3)3 Si has vacant d orbitals which providepπdπ bonding and so nitrogen has sp2 hybridization with trigonal planar shape.

The lone pair in nitrogen remains in N(CH3)3 causing lp-bp repulsion and N(SiH3)3 lone pair is transferred to d-orbital forming pπdπ bonding.

Reason is the correct explanation for assertion.

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