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प्रश्न
Which of the following pairs of compounds are positional isomers?
विकल्प
\[\begin{array}{cc}
\phantom{}\ce{CH3 - CH2 - CH2 - C - CH3}\\
\phantom{..............}||\\
\phantom{..............}\ce{O}
\end{array}\]and
\[\begin{array}{cc}
\phantom{}\ce{CH3 - CH2 - C - CH2 - CH3}\\
\phantom{}||\\
\phantom{}\ce{O}
\end{array}\]\[\ce{CH3 - CH2 - CH2 - CH2 - CHO}\]
and
\[\begin{array}{cc}
\phantom{..............}\ce{O}\\
\phantom{..............}||\\
\phantom{}\ce{CH3 - CH2 - CH2 - C - CH3}
\end{array}\]\[\begin{array}{cc}
\phantom{}\ce{CH3 - CH2 - CH2 - C - CH3}\\
\phantom{..............}||\\
\phantom{..............}\ce{O}
\end{array}\]and
\[\begin{array}{cc}
\phantom{}\ce{CH3 - CH - CH2 - CHO}\\
|\phantom{..........}\\
\ce{CH3}\phantom{.......}
\end{array}\]\[\begin{array}{cc}
\phantom{}\ce{CH3 - CH2 - C - CH2 - CH3}\\
\phantom{}||\\
\phantom{}\ce{O}
\end{array}\]and
\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
\backslash\phantom{.............}\\
\phantom{......}\ce{CH - CH2 - CHO}\\
/\phantom{..............}\\
\ce{CH3}\phantom{.................}
\end{array}\]
उत्तर
\[\begin{array}{cc}
\phantom{}\ce{CH3 - CH2 - CH2 - C - CH3}\\
\phantom{..............}||\\
\phantom{..............}\ce{O}
\end{array}\]
and
\[\begin{array}{cc}
\phantom{}\ce{CH3 - CH2 - C - CH2 - CH3}\\
\phantom{}||\\
\phantom{}\ce{O}
\end{array}\]
Explanation:
Option (a) Pentan-2-one and pentan-3-one are positional isomers.
Options (b), (c) and (d) contain different compounds aldehydes and ketones.
These exhibit functional group isomerism.
