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Question

The correct decreasing order of strength of the bases OH,NH2, HCC and CH3CH2 is:

A
CH3CH2>NH2>HCC>OH
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B
HCC>CH3CH2>NH2>OH
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C
OH>NH2>HCC>CH3CH2
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D
NH2>HCC>OH>CH3CH2
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Solution

The correct option is A CH3CH2>NH2>HCC>OH
Making conjugate acids of all:
i)CH3CH3CH3¯CH2+H+
Acid (Conjugate Base)
strong weak
ii) NH3NH2+H+
Acid (CB)
strong weak
iii)HC=CHHC=C+H+
(Acid) (CB)
strong weak Base
iv)H2OH++OH
Acid (CB)
order of Basicity : CH3¯CH2>¯NH2>HCC>OH

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