JEE Main 20252 AprilMorning Shift
- Exam
- JEE Main
- Year
- 2025
- Date
- 2 April
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Amines
JEE Main 2025 · 2 April · Morning Shift · Chemistry · Amines
The correct order of basic nature on aqueous solution for the bases...
The correct order of basic nature on aqueous solution for the bases (\mathrm{NH}}_{3}, \mathrm{H}}_{2} \mathrm{~N}-\mathrm{NH}}_{2}, \mathrm{CH}}_{3} \mathrm{CH}}_{2} \mathrm{NH}}_{2}), (\left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_2\mathrm{NH}) and (\left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_3 ) is :
Options
- A(\mathrm{NH}}_{3} \lt \mathrm{H}}_{2} \mathrm{~N}-\mathrm{NH}}_{2} \lt \left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_3 \mathrm{~N} \lt) (\mathrm{CH}}_{3} \mathrm{CH}}_{2} \mathrm{NH}}_{2} \lt \left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_2\mathrm{NH}$)
- B(\mathrm{NH}}_{3} \lt \mathrm{H}}_{2} \mathrm{~N}-\mathrm{NH}}_{2} \lt \mathrm{CH}}_{3} \mathrm{CH}}_{2} \mathrm{NH}}_{2} \lt) (\left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_2\mathrm{NH} \lt \left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_3\mathrm{~N}$)
- C(\mathrm{H}}_{2} \mathrm{~N}-\mathrm{NH}}_{2} \lt \mathrm{NH}}_{3} \lt \left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_3 \mathrm{~N} \lt) (\mathrm{CH}}_{3} \mathrm{CH}}_{2} \mathrm{NH}}_{2} \lt \left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_2\mathrm{NH}$)
- D(\mathrm{NH}}_{2}- \mathrm{NH}}_{2} \lt \mathrm{NH}}_{3} \lt \mathrm{CH}}_{3} \mathrm{CH}}_{2} \mathrm{NH}}_{2} \lt) (\left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_3\mathrm{~N} \lt \left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_2\mathrm{NH}$)
Correct answer
D. (\mathrm{NH}}_{2}- \mathrm{NH}}_{2} \lt \mathrm{NH}}_{3} \lt \mathrm{CH}}_{3} \mathrm{CH}}_{2} \mathrm{NH}}_{2} \lt) (\left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_3\mathrm{~N} \lt \left(\mathrm{CH}}_{3} \mathrm{CH}}_{2}\right)_2\mathrm{NH}$)
Step-by-step solution
Basic strength of amine depends on hydrogen bonding and electronic inductive effect.
(\mathrm{NH}(\mathrm{Et})_2 \gt \mathrm{N}(\mathrm{Et})_3 \gt \mathrm{NH}_2 \mathrm{Et} \gt \mathrm{\stackrel{\cdot \cdot}{N}H}_3 \gt \mathrm{NH}_2-\mathrm{NH}_2)
(\mathrm{NH}(\mathrm{Et})_2 \gt \mathrm{N}(\mathrm{Et})_3 \gt \mathrm{NH}_2 \mathrm{Et} \gt \mathrm{\stackrel{\cdot \cdot}{N}H}_3 \gt \mathrm{NH}_2-\mathrm{NH}_2)