MCQ
Which of the following pair are not resonating structure ?
- A

- B

- ✓$C{H_2} = CH - CH = C{H_2}\, \leftrightarrow \,\dot C{H_2} - CH = CH - \dot C{H_2}$
- D




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$IUPAC$ name of Compound $A$ is $4-$ chloro-$1$, $3$-dinitrobenzene:
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$IUPAC$ name of Compound $B$ is
$4$-ethyl-$2$-methylaniline.
In the light of the above statements, choose the most appropriate answer from the options given below:

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