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Which compound among the following give/...

Which compound among the following give/s positive iodoform test ?
1. Ethanol 2. Ethanal
3. 1-butanol 4. 2-butanol
5. Phenyl ethanal

A

1, 2 and 5

B

1, 3 and 4

C

1, 2 and 3

D

1, 2 and 4

Text Solution

Verified by Experts

The correct Answer is:
D
Carbonyl compounds having `CH_(3)CO`-groups and alcohols having `CH_(3)CH(OH)`- goup undergo iodoform reaction.
`underset("ethanol")(CH_(3)CH_(2)OH) + 4I_(2) + 6NaOH overset(Delta)rarr underset("iodoform")(CHI_(3)) + HCOONa + 5NaI + 5H_(2)O`
`underset("ethanal")(CH_(3)CHO)+3I_(2) + NaOH overset(Delta)rarr underset("iodoform")(CHI_(3)) + HCOONa + 3HI`
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