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Question

Which of the following compound(s), on being warmed with iodine solution and $$NaOH$$ gives iodoform test?


A
CH3CH2OH
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B
CH3COCH3
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C
CH3CH(OH)CH3
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D
 CH3OH
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Solution

The correct options are
A $$CH_3-CH(OH)-CH_3$$
B $$CH_3COCH_3$$
D $$CH_3CH_2OH$$
Haloform reaction is shown by primary alcohol $${ C }_{ 2 }{ H }_{ 5 }OH$$ which on partial oxidation gives $$C{ H }_{ 3 }-CHO$$.
Secondary alcohols with methyl group $$\left( C{ H }_{ 3 }-CHOH-C{ H }_{ 3 } \right) $$ on oxidation which give methyl ketonic groups show positive result for haloform test. Methyl ketonic compounds show positive result.

Thus, (i), (ii), (iii) give positive result for iodoform test.

Chemistry
NCERT
Standard XII

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