Question:
Assertion (A): Ammonia cannot exhibit hydrogen bonding in solid and liquid states.
Reason (R): Ammonia has higher melting and boiling points than predicted.
Assertion (A): Ammonia cannot exhibit hydrogen bonding in solid and liquid states.
Reason (R): Ammonia has higher melting and boiling points than predicted.
Reason (R): Ammonia has higher melting and boiling points than predicted.
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NH\(_3\) exhibits hydrogen bonding but weaker than H\(_2\)O due to lower electronegativity of nitrogen.
Updated On: Jun 20, 2026
- Both (A) and (R) are correct and (R) is correct explanation of (A)
- Both (A) and (R) are correct but (R) is not correct explanation of (A)
- (A) is correct but (R) is incorrect
- (A) is incorrect but (R) is correct
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The Correct Option is D
Solution and Explanation
Step 1: Analyze Assertion (A).
Ammonia (NH\(_3\)) does exhibit hydrogen bonding due to presence of N–H bonds and lone pair on nitrogen. Therefore, assertion is incorrect.
Step 2: Nature of hydrogen bonding in NH\(_3\).
In solid and liquid states, NH\(_3\) molecules form intermolecular hydrogen bonding, though weaker than water due to lower electronegativity of nitrogen.
Step 3: Analyze Reason (R).
Ammonia has higher melting and boiling points than expected for its molecular mass due to hydrogen bonding. Hence reason is correct.
Step 4: Compare both statements.
Since NH\(_3\) does show hydrogen bonding, Assertion is false. However, Reason correctly describes elevated boiling and melting points.
Step 5: Check relationship.
Reason is not explaining assertion because assertion itself is incorrect.
Step 6: Final conclusion.
Thus A is incorrect but R is correct.
Final Answer: \[ \boxed{(4)} \]
Ammonia (NH\(_3\)) does exhibit hydrogen bonding due to presence of N–H bonds and lone pair on nitrogen. Therefore, assertion is incorrect.
Step 2: Nature of hydrogen bonding in NH\(_3\).
In solid and liquid states, NH\(_3\) molecules form intermolecular hydrogen bonding, though weaker than water due to lower electronegativity of nitrogen.
Step 3: Analyze Reason (R).
Ammonia has higher melting and boiling points than expected for its molecular mass due to hydrogen bonding. Hence reason is correct.
Step 4: Compare both statements.
Since NH\(_3\) does show hydrogen bonding, Assertion is false. However, Reason correctly describes elevated boiling and melting points.
Step 5: Check relationship.
Reason is not explaining assertion because assertion itself is incorrect.
Step 6: Final conclusion.
Thus A is incorrect but R is correct.
Final Answer: \[ \boxed{(4)} \]
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