Among the following compounds, strongest acid is

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HC≡CH

C6H6

C2H6

CH3OH

answer is D.

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Detailed Solution

In ethane (C2H6) and benzene (C6H6) hydrogen atoms are present on sp3 and sp2 hybridised carbon atom, so these are very weak acids as compared to CH≡CH (having sp carbon) and CH3OH (having electronegative oxygen) To decide whether CH≡CH or CH3OH is a stronger acid, consider the following reaction. HC≡C−Na++CH3OH(stronger acid)→HC(weaker acid)≡CH+CH3O−Na+ Since a stronger acid displaces a weaker acid from its salts, therefore, CH3OH is a stronger acid thanHC≡CH . Alternatively, CH3O− is weaker base than HC≡C− because oxygen can accommodate negative charge easily.

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