A) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\underset{O}{\mathop{\underset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{3}}\] and \[C{{H}_{3}}-C{{H}_{2}}-\underset{O}{\mathop{\underset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}\]
B) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-CHO\] and \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\overset{O}{\mathop{\overset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{3}}\]
C) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\underset{O}{\mathop{\underset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{3}}\] and \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{\parallel }{\mathop{CH}}\,}}\,-C{{H}_{2}}-CHO\]
D)
\[C{{H}_{3}}-C{{H}_{2}}-\underset{O}{\mathop{\underset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}\] and 
Correct Answer: A
Solution :
[a] Pentan-2-one and pentan-3-one are position isomers. [b], [c], [d] contain different compounds aldehyde and ketones.
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