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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
$\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,\,\,} \\ 
{||\,\,\,\,\,\,\,\,\,\,} \\ 
{C{H_3} - C\mathop {-} \limits_a O \mathop {-} \limits_b C{H_3}} 
\end{array}$

The correct relation between the bond lengths $a$ and $b$ is

  • A
    $a = b$
  • ✓
    $b > a$
  • C
    $b < a$
  • D
    Impossible to predict
✓

Answer

Correct option: B.
$b > a$
b
$\begin{array}{*{20}{c}}
{{O^{\delta  - }}\,\,\,\,\,\,\,}\\
{| \vdots \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{C{H_3} - C\,\underline  \cdots  \,\mathop O\limits^{\delta  + }  - C{H_3}}
\end{array}$

due to resonance this bond has partial double bond characters

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