Question

nitrogen at the center of $-nh_{2}$
bent
trigonal planar
trigonal pyramidal
tetrahedral

Explanation:

Step1: Determine the electron - pair geometry

Nitrogen in \(-NH_2\) has 4 electron pairs (2 bonding pairs with H and 2 lone pairs). According to VSEPR theory, 4 electron pairs give a tetrahedral electron - pair geometry.

Step2: Determine the molecular geometry

Since there are 2 lone pairs, the molecular geometry is bent. Lone pairs repel bonding pairs more strongly, causing the molecule to deviate from the tetrahedral electron - pair geometry to a bent shape.

Answer:

bent