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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
Most stable carbonium ion is
  • A
    ${\mathop C\limits^ + _2}{H_5}$
  • B
    ${(C{H_3})_3}\mathop C\limits^ + $
  • ✓
    ${({C_6}{H_5})_3}\mathop C\limits^ + $
  • D
    ${C_6}{H_5}\mathop C\limits^ + {H_2}$
✓

Answer

Correct option: C.
${({C_6}{H_5})_3}\mathop C\limits^ + $
c
(c)In the triphenyl methyl carbonium ion the $\pi$ electrons of all the three benzene rings are delocalised with the vacant $p-$orbital of central carbon atom. So, it is resonance stabilised. It is the most stable of all the carbonium ions given

The ion $C{H_3} - \mathop {\mathop {{C^ + }}\limits_{|\;\;}^{|\;\;} \;\;}\limits_{C{H_3}}^{C{H_3}} $ is stabilised by hyperconjugation, a second order resonance.

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