MHT CET 202622 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 22 April
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Amines
MHT CET 2026 · 22 April · Morning Shift · Chemistry · Amines
Identify the weakest base almong the following.
Identify the weakest base almong the following.
Options
- AAmmonia
- Biso-propyl amine
- Cn-propyl amine
- DPhenyl amine
Correct answer
D. Phenyl amine
Step-by-step solution
Phenyl amine (aniline) has a benzene ring attached to the amino group.
The lone pair of electrons on the nitrogen atom is delocalized over the benzene ring due to resonance.
This delocalization decreases the electron density on the nitrogen atom, making the lone pair less available for protonation.
In contrast, ammonia has no such delocalization, and aliphatic amines (iso-propyl amine and n-propyl amine) have electron-donating alkyl groups (+I effect) that increase the electron density on nitrogen, making them stronger bases than ammonia.
Thus, phenyl amine is the weakest base among the given options.
Answer: Phenyl amine
The lone pair of electrons on the nitrogen atom is delocalized over the benzene ring due to resonance.
This delocalization decreases the electron density on the nitrogen atom, making the lone pair less available for protonation.
In contrast, ammonia has no such delocalization, and aliphatic amines (iso-propyl amine and n-propyl amine) have electron-donating alkyl groups (+I effect) that increase the electron density on nitrogen, making them stronger bases than ammonia.
Thus, phenyl amine is the weakest base among the given options.
Answer: Phenyl amine