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Meso Compounds

9. structure ...

Question

9. structure of N(CH_3)_3 is nonplanar where as N(SiH_3)_3 is planar. Why?

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N (C H_{3})_{3}

is pyramidal but

N (S i H_{3})_{3}

is planar. Reason: In

N (C H_{3})_{3}

N

remains on it causing

l p - b p

repulsion while in

N (S i H_{3})_{3}

, lone pair is transferred to vacant

d

S i

.

N (C H_{3})_{3}

N (S i H_{3})_{3}

s p^{3} -

N -

atom and Pyramidal structure.

N (C H_{3})_{3}

is pyramidal but

N (S i H_{3})_{3}

is planar. Reason: In

N (S i H_{3})_{3}

N -

atom is transferred to the empty

d -

orbitals of silicon

(p π - d π

Q. Structures of

N (C H_{3})_{3}

N (S i H_{3})_{3}

are different. It is due to the fact that :

Q. The geometry of

N (C H_{3})_{3}

N (S i H_{3})_{3}

respectively, is:

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