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The increasing basicity order of the fol...

The increasing basicity order of the following compounds is :
`(a) CH_3CH_2CH_2" "(B)CH_3CH_2overset(CH_2CH_3)overset(|)(NH)`
`H_(3)C-overset(CH_3)overset(|)N-CH_3" "Ph-overset(CH_3)overset(|)(N)-H`

A

(A) lt (B) lt (D) lt (C )

B

(A) lt (B) lt (C ) lt (D)

C

(D) lt (C ) lt (A) lt (B)

D

(D) lt (C ) lt (B) lt (A)

Text Solution

Verified by Experts

The correct Answer is:
C
For `Ph=overset(CH_(2))overset("| ")"N "-H`, lone pair of N is involved in resonance, so it is least basic
`CH_(3)CH_(2)NH_(2)" "pK_(b)=3.29`
`{:(CH_(3)CH_(2)-NH" "pK_(b)=3.00),(" |"),(" "CH_(2)CH_(3)):}`
`H_(3)C-underset(CH_(3))underset("| ")"N "-CH_(3)" "pK_(b)=4.22`
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