Question

Consider structures I to VII and answer the question

$I$

$II$

$III$

$IV$

$V$

$VI$

$VII$

Identify the pairs of compounds that represents chain isomerism.

Answer 1

Chain isomerism

Isomers which differ in parent chain or side chain are called chain isomerism.

$\left(I\right)$

$\left(III\right)$

$\left(I\right)$
$\left(IV\right)$

$\left(II\right)$

$\left(III\right)$

$\left(II\right)$

$\left(IV\right)$

$\left(V\right)$

$\left(VI\right)$

$\left(V\right)$

$\left(VII\right)$

All these pairs vary in the parent chain. Therefore, all these pairs are chain isomers.

Thus, $I$ and $III,I$ and $IV,II$ and $III,II$ and $IV,V$ and $VI,V$ and $VII$ are pairs of chain isomers.