1.

What is the decreasing order of strength of the bases OH^(-), NH_(2)^(-), HC=C^(-)and CH_(3)CH_(2)^(-)?

Answer»

`CH_(2)CH_(2)^(-) gt HC=C^(-) gtNH_(2)^(-) gt OH^(-)`
`HC=C^(-) gtCH_(2)CH_(2)^(-) gt NH_(2)^(-) gt OH^(-)`
`OH^(-) gtNH_(2)^(-) gt HC=C^(-) gt CH_(3)CH_(2)^(-)`
`NH_(2)^(-) gtHC=C^(-)gt OH^(-) gt CH_(3)CH_(2)^(-)`

Solution :Stronger the ACID, weaker the conjugate base. Since acidic character FOLLOWS the follow the order
`H_(2)OgtNH_(3)gtHC=CHgtCH_(3)-CH_(3)`
the basic character of their conjugate bases decreases in the reverse order. i.e., `HC=C^(-) gtCH_(2)CH_(2)^(-) gt NH_(2)^(-) gt OH^(-)`


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