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Considering the basic strength in the ga...

Considering the basic strength in the gas phase which one has the smallest `pK_(a)` ? .

A

`(CH_(3))_(3)N`

B

`NH_(3)`

C

`(CH_(3))_(2)NH`

D

`Ch_(3)NH_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
lower `pK_(a)rarr` higher `pK_(b)rarr` lower `K_(b)rarr` weak base All the aliphatic amines are stronger bases than ammonia Basicity is controlled by the availability of the lone pair for protonation Because of the positive inductive effect of alky1 groups the lone pair becomes more available Therefore the basicity increases with the number of alky1 groups
`(CH_(3))_(3)Ngt(CH_(3))_(2)NHgtCH_(3)NH_(2)gtNH_(3)` .
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