• # question_answer Among the following the dissociation constant is highest for [AIIMS 2004] A) ${{C}_{6}}{{H}_{5}}OH$ B) ${{C}_{6}}{{H}_{5}}C{{H}_{2}}OH$ C) $C{{H}_{3}}C\equiv CH$ D) $C{{H}_{3}}NH_{3}^{+}C{{l}^{-}}$

Dissociation of proton from $C{{H}_{3}}-\overset{+}{\mathop{N}}\,{{H}_{3}}C{{l}^{-}}$ is very difficult due to -I effect of $C{{l}^{-}}$ and ${{N}^{+}}$ while in ${{C}_{6}}{{H}_{5}}OH$ due to resonance stabilization of phenoxide ion proton eliminate easily similarly due to H-bonding in ${{C}_{6}}{{H}_{5}}C{{H}_{2}}OH$ it can be eliminate and $C{{H}_{3}}C\equiv CH$ show acidic character by triple bond by which proton can be dissociate.