Given below are two statements — Assertion (A) and Reason (R):

Assertion (A): has lower boiling point than .

Reason (R): In liquid state, molecules are associated through hydrogen bonding, but mo

Question

Given below are two statements — Assertion (A) and Reason (R):

Assertion (A):  has lower boiling point than .

Reason (R): In liquid state,  molecules are associated through hydrogen bonding, but  molecules are associated through Van der Waals forces.

Choose the most appropriate answer:

Canvas Classes · Accepted Answer

Step 1 — Evaluate Assertion (A):
- Boiling point of  ≈ −87.7°C
- Boiling point of  ≈ −33.4°C
-  has lower boiling point than  ✓ A is correct

Step 2 — Evaluate Reason (R):
- : N–H bonds + lone pair on N → hydrogen bonding → stronger intermolecular forces → higher boiling point ✓
- : P is not electronegative enough for H-bonding → only Van der Waals forces → weaker intermolecular forces → lower boiling point ✓
- R is correct ✓

Step 3: R correctly explains A — the hydrogen bonding in  raises its

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