NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    Which of the following pairs of compounds are positional isomers?

    A) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\underset{\underset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-C{{H}_{3}}\]  and      \[C{{H}_{3}}-C{{H}_{2}}-\underset{\underset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-C{{H}_{2}}-C{{H}_{3}}\]

    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) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\underset{\underset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-C{{H}_{3}}\]  and \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,H}}\,-C{{H}_{2}}-CHO\]

    D) \[C{{H}_{3}}-C{{H}_{2}}-\underset{\underset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-C{{H}_{2}}-C{{H}_{3}}\] 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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