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Which of the following species is both planar and polar?

1. SO3
2. POCl3
3. NH2⁻
4. SO3²-

Correct answer: NH2⁻

Solution

SO3: trigonal planar (sp² hybridized S), symmetric -> non-polar. Not polar. POCl3: P has 4 groups (P=O, 3 P-Cl), tetrahedral geometry -> not planar. Polar yes, but not planar. NH2⁻: N has 2 H + 2 lone pairs, bent geometry (sp³ or sp²?). As anion, N is sp³ -> pyramidal... but with only 3 atoms (N, H, H), any triatomic is inherently planar (3 atoms define a plane). So NH2⁻ is planar (always, as only 3 atoms) and bent/polar (2 N-H dipoles don't cancel). Polar and planar. SO3²-: S has 3 O + 1 lone pair, pyramidal (like SO3²- is sp³) -> not planar. Polar but not planar. Answer: NH2⁻.

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