The correct order of decreasing basic strength of the following species is:
(H₂O, OH^–,C₂H₅OH, C₂H₅O^–)

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${OH}^{-} > C_{2} H_{5} O^{-} > C_{2} H_{5} OH > H_{2} O$

$C_{2} H_{5} O^{-} > {OH}^{-} > C_{2} H_{5} OH > H_{2} O$

$C_{2} H_{5} OH < H_{2} O < {OH}^{-} < C_{2} H_{5} O^{-}$

$H_{2} O < C_{2} H_{5} OH < C_{2} H_{5} O^{-} < {OH}^{-}$

answer is B.

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Detailed Solution

Conjugate base of ethanol is ethoxide ion (C₂H₅O^- ) and it is highly basic in nature. Conjugate base of water is hydroxide ion (OH^- ) and it is basic than C₂H₅OH and H₂O. Among C₂H₅OH and H₂O, C₂H₅OH is more basic than H₂O.

$C_{2} H_{5} O^{-} > {OH}^{-} > C_{2} H_{5} OH > H_{2} O$

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