Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : PH₃ has lower boiling point than NH₃.
Reason (R) : In liquid state NH₃ molecules are associated through vander waal’s forces, but PH₃ molecules are associated through hydrogen bonding.
In the light of the above statements.
Choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are correct and (R) is not the correct explanation of (A)
• B. (A) is not correct but (R) is correct
• C. Both (A) and (R) are correct but (R) is the correct explanation of (A)
• D. (A) is correct but (R) is not correct

Answer 1

The Correct Option is D

Unlike \( \text{NH}_3 \), \( \text{PH}_3 \) molecules are not associated through hydrogen bonding in the liquid state.

This is why the boiling point of \( \text{PH}_3 \) is lower than that of \( \text{NH}_3 \).