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What is the decreasing order of strength...

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

A

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

B

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

C

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

D

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

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The correct Answer is:
A
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