JEE Main & Advanced Sample Paper JEE Main Sample Paper-43

  • question_answer
    Which of the following can give iodo form test?
    (I) \[C{{H}_{3}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\] (II) \[{{C}_{6}}{{H}_{5}}-C{{H}_{2}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\]
    (III) \[C{{H}_{3}}-CHO\] (IV) \[{{C}_{6}}{{H}_{5}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\]

    A)  Only IV                      

    B)  III and IV          

    C)  III and IV                    

    D)  All of these

    Correct Answer: C

    Solution :

     In (I) and (II) the hydrogen atom of?CH3 group is not attacked by the base rather more acidic H-atom about two carbonyl group in (I) and methylene H-atom about phenyl group in (II) is attacked.

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