A) \[C{{H}_{3}}CN\]
B) \[C{{H}_{3}}OH\]
C) \[C{{H}_{3}}COC{{H}_{3}}\]
D) \[{{C}_{6}}{{H}_{5}}OH\]
Correct Answer: C
Solution :
Key Idea: The compounds containing \[C{{H}_{3}}\text{ }\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,\]group give positive iodoform test. \[C{{H}_{3}}CN,\text{ }C{{H}_{3}}OH\]and\[{{C}_{6}}{{H}_{5}}OH\]do not give iodoform test because they don't have \[C{{H}_{3}}\text{ }\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,\]group. Only\[C{{H}_{3}}COC{{H}_{3}}\] (acetone) gives positive iodoform test as it contains\[C{{H}_{3}}CO\]group. \[\underset{Acetone}{\mathop{C{{H}_{3}}COC{{H}_{3}}}}\,+3{{I}_{2}}+NaOH\xrightarrow[{}]{{}}\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,Iodoform \\ (yellow\text{ }coloured \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,solid) \end{smallmatrix}}{\mathop{CH{{I}_{3}}}}\,\] \[+\text{ }HCOONa+{{H}_{2}}O\]
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