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In the following question, an Assertion ...

In the following question, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer.
Assertion : In case of `(CH_3)_3N` geometry is pyramidal, but in case of `(SiH_3)_3N` it is planar.
Reason : The maximum covalency of Si is six but that of C is four. : If both (A) and (R) are correct and (R) is the correct explanation of (A)., If both (A) and (R) are correct, but (R) is not the correct explanation of (A)., If (A) is correct, but (R) is incorrect., If both (A) and (R) are incorrect.

A

If both (A) and (R) are correct and (R) is the correct explanation of (A).

B

If both (A) and (R) are correct, but (R) is not the correct explanation of (A).

C

If (A) is correct, but (R) is incorrect.

D

If both (A) and (R) are incorrect.

Text Solution

Verified by Experts

The correct Answer is:
B
Geometry of `(CH_3)_3 ddotN` is pyramidal due to non-availability of d-orbitals in C, whereas geometry of `(SiH_3)_3 ddotN` is planar due to availability of d-orbitals in Si and it forms (`p pi-d pi`) back bonding.
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