Which one of the following pairs is an example of polar molecular solids?

Question

Canvas Classes · Accepted Answer

Polar molecular solids are made of polar molecules held together by dipole–dipole interactions and/or hydrogen bonds.

Step 1 — Analyse each pair:

(1) , :
- : bent, polar ✓
- : linear, non-polar ✗
- Not both polar ✗

(2) , :
- : bent, polar ✓
- : pyramidal, polar ✓
- Both polar molecular solids ✓

(3) , :
- MgO: ionic solid (not molecular) ✗

(4) , AlN(s):
- HCl: polar molecular ✓
- AlN: covalent network solid ✗

Answer: Option (2) — ,

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