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The decreasing order of pK(b) of given O...

The decreasing order of `pK_(b)` of given `OH^(-),NH_(2)^(-),CH-=C^(-),CH_(3)CH_(2)^(-)` is
(1) `CH_(3)CH_(2)^(-)>NH_(2)^(-)>OH^(-)>CH-=C^(-)`
(2) `CH-=C^(-)>NH_(2)^(-)>OH^(-)>CH_(3)CH_(2)^(-)`
(3) `OH^(-)>CH-=C^(-)>NH_(2)^(-)>CH_(3)CH_(2)^(-)`
(4) `NH_(2)^(-)>CH-=C^(-)>CH_(3)CH_(2)^(-)>OH^(-)`

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The decreasing order of strength of the bases, OH^(-), NH_(2)^(-), H-C-=C^(-) and CH_(3)-CH_(2)^(-) :

(CH_(3)(OH)_(2)^(1)) is..acidic than (CH_(3)NH_(3)^(+)) .

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