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  4. Which of the following does not answer iodoform test?

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Q. Which of the following does not answer iodoform test?

KEAMKEAM 2007Aldehydes Ketones and Carboxylic Acids

Solution:

lodoform test is given by the compounds containing
$ C{{H}_{3}}CO $ group or $ C{{H}_{3}}\overset{|}{\mathop{C}}\,HOH $
group. $ C{{H}_{3}}CHO+3{{I}_{2}}+3\text{ }NaOH\to $ $ \underset{\begin{smallmatrix} (yellow\text{ }ppt) \\ \,\,\,\,iodoform \end{smallmatrix}}{\mathop{CH{{I}_{3}}+}}\,HCOONa+3NaI+3{{H}_{2}}O $
$ \because $ n butyl alcohol $ (C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}OH) $ does not give iodoform test because it does not possess the $ C{{H}_{3}}CO $ or $ C{{H}_{3}}\overset{|}{\mathop{C}}\,HOH $ group.