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8.4. Organic chemistry reaction mechanism — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry8.4. Organic chemistry reaction mechanism1 Mark
MCQ
Among the following the dissociation constant is highest for
  • A
    ${C_6}{H_5}OH$
  • B
    ${C_6}{H_5}C{H_2}OH$
  • C
    $C{H_3}C \equiv CH$
  • ✓
    $C{H_3}NH_3^ + C{l^ - }$
✓

Answer

Correct option: D.
$C{H_3}NH_3^ + C{l^ - }$
d
(d) Dissociation of proton from $C{H_3} - \mathop N\limits^ + {H_3}C{l^ - }$ 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.

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