* 20 c O , , , , , , , , , , || , , , , , , , , , , C H_3 - C- _a… - Vidyadip

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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