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In most of the amines, the nitrogen has an sp3 hybridization with a pyramidal geometry having bond angles close to 109°. In contrast, the nitrogen atom in methanamide has sp2 hybridization and trigonal planar geometry with bond angles of 120°, approximately. Explain this unusual behavior.

Do the indicated sp3 carbons lie in the same plane as the sp2 carbons in the following molecules?

Estimate the bond angles for the bonds mentioned below.
a. the H—C—N bond in HC≡N.
b. the C—C—N bond in CH3CH2NHCH3.
Provide the Lewis structure for HCHO and predict the shape around its central atom.
Consider the following species: CF4, +CH3, and BH3. Identify those with bond angles of:
(i) 120°
(ii) 109.5°
Estimate the value of the C–O–C bond angle in the following ether molecule.
