MCQ
Amongst the following, the strongest base in aqueous medium is ____________.
- ACH3NH2
- BNCCH2NH2
- C(CH3)2NH
- DC6H5NHCH3
✓
Answer
- (CH3)2NH
Explanation:
Due to the electron releasing nature of alkyl group, it (R) pushes electrons towards nitrogen and thus makes the unshared electron pair more available for sharing with the proton of the acid. Moreover, the substituted ammonium ion formed from the amine gets stabilised due to dispersal of the positive charge by the +I effect of the alkyl group. Hence, alkylamines are stronger bases than ammonia.
Thus, the basic nature of aliphatic amines should increase with increase in the number of alkyl groups.
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