- AStatement 1 is True, Statement 2 is True, Statement 2 is a CORRECT explanation for Statement 1
- BStatement 1 is True, Statement 2 is True, Statement 2 is NOT a CORRECT explanation for Statement 1
- CStatement 1 is True, Statement 2 is False
- DStatement 1 is False, Statement 2 is True
View written solutionFree
Correct answer: D
-
Identify the compounds
- -Hydroxybenzoic acid = salicylic acid
- -Hydroxybenzoic acid = para-hydroxybenzoic acid
-
Analyze Statement 2 first
Statement 2 says: -Hydroxybenzoic acid has intramolecular hydrogen bonding.
This is true.
In -hydroxybenzoic acid, the group and group are adjacent, so hydrogen bonding can occur within the same molecule:
-
Effect of intramolecular vs intermolecular hydrogen bonding on boiling point
- Intramolecular hydrogen bonding reduces association between molecules.
- Intermolecular hydrogen bonding increases attraction between molecules, which tends to increase boiling point.
Since -hydroxybenzoic acid shows intramolecular H-bonding, its molecules are less associated with one another.
On the other hand, -hydroxybenzoic acid cannot form such intramolecular H-bonding due to the large separation of groups, so it forms stronger intermolecular hydrogen bonding.
Therefore, -hydroxybenzoic acid has higher boiling point than -hydroxybenzoic acid.
-
Analyze Statement 1
Statement 1 says: -Hydroxybenzoic acid has a lower boiling point than -hydroxybenzoic acid.
From the above reasoning, this is false.
Actually,
-
Evaluate the options
- A: Statement 1 true, Statement 2 true, explanation correct ❌
- B: Statement 1 true, Statement 2 true, explanation not correct ❌
- C: Statement 1 true, Statement 2 false ❌
- D: Statement 1 false, Statement 2 true ✅
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Final answer
The correct option is:
-
Comparison with stored correct answer
Stored correct answer = D
My derived answer = D
So, the derived answer agrees with the stored correct answer.
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