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What is the expected geometry of CH3-NH-CH3?

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in Chemistry – Class 12 by (188k points)
What is the expected geometry of CH3-NH-CH3?

(a) Square planar

(b) Trigonal planar

(c) Trigonal pyramidal

(d) Trigonal bipyramidal

The question was posed to me during an internship interview.

This intriguing question originated from Structure of Amines in portion Amines of Chemistry – Class 12

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Correct choice is (c) Trigonal pyramidal

Explanation: CH3-NH-CH3 is an amine in which two hydrogen atoms are replaced by methyl groups. The hybridisation of N atom of amines is same as that of ammonia, and is also expected to have a pyramidal geometry, with N at the apex and the groups CH3, H and CH3 occupying the corners of a trigonal base.

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