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  4. Which of the following alcohol give positive iodoform test?

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Q. Which of the following alcohol give positive iodoform test?

Jharkhand CECEJharkhand CECE 2004

Solution:

lodoform test is given by alcohols which produce carbonyl compounds having $CH _{3} CO$ group.
(i) $CH _{3} OH \xrightarrow{[O]} HCHO $, no $CH _{3} CO$ group, no iodoform test
(ii) $\underset{\text{methyl carbinol}}{C_2H_5OH} \xrightarrow{[O]} CH_3CHO$,
has $CH_3CO$ group, gives iodoform test
(iii) $\underset{\text{ethyl carbinol}}{C_2H_5CH_2OH} \xrightarrow{[O]} C_2H_5CHO$,
no $CH_3CO$ group no iodoform test.
(iv) $CH _{3}- CH _{2}- CH ( OH )- CH _{2}- CH _{3} \xrightarrow{[ O ]}$
$CH_3 - CH_2 - \overset{\underset{||}{O}}{C} - CH_2 - CH_3$
NO $CH_3CO$ group, no iodoform test.
$\therefore $ Only methyl carbinol gives iodoform test.