NEET
- Exam
- NEET
- Subject
- Chemistry
- Chapter
- Amines
NEET · Chemistry · Amines
Given below are two statements; one is labelled as Assertion (A)...
Given below are two statements; one is labelled as Assertion (A) and the other is labelled as Reason(R).
Assertion : The correct boiling point order of isomeric amines is -
Primary > Secondary > Tertiary
Reason : The intermolecular H-bonding in primary amine is maximum due to two hydrogen available for more association but in tertiary amine there is no hydrogen available for H -bond. In the light of the above statements, choose the most appropriate answer from the options given below :
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A).
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A).
- C(A) is correct but (R) is not correct.
- D(A) is not correct but (R) is correct.
Correct answer
A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
Step-by-step solution
Assertion (A):
The correct boiling point order of isomeric amines is - Primary > Secondary > Tertiary.
This statement is correct. Primary amines generally have higher boiling points than secondary and tertiary amines due to stronger hydrogen bonding.
Reason (R):
The intermolecular H -bonding in primary amine is maximum due to two hydrogens available for more association, but in tertiary amine, there is no hydrogen available for H -bond.
This statement is also correct. Primary amines can form more hydrogen bonds because they have two hydrogen atoms on the nitrogen, while tertiary amines lack hydrogen atoms on nitrogen, thus they cannot form hydrogen bonds.
Conclusion:
Both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion about the boiling point order.
The most appropriate answer is: (1) Both (A) and (R) are correct and (R) is the correct explanation of (A).