Question

Why ethyl alcohol gives positive iodoform test?

Answer 1

Ethyl alcohol gives positive iodoform test

Explanation:

• For the iodoform reaction to take place, the compound should contain $CH_3-CHR-OH$, where R can be H or an alkyl group.  Thus, ethanol gives a positive iodoform test. The compounds which give positive iodoform test are the ones with Alpha methyl groups.
• Ethanol is the only primary alcohol to give the triiodomethane (iodoform) reaction.  If "R" is a hydrocarbon group, then you have a secondary alcohol. Lots of secondary alcohols give this reaction, but those that do all have a methyl group attached to the carbon with the -OH group.

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Answer 2

Answer:

What the Iodoform Reaction Shows

A positive result is the formation of a pale yellow precipitate of triiodomethane (iodoform) - is given by an alcohol containing the grouping:

                                                            H

                                                             |

                                             H3C   -   C   -   OH

                                                             |

                                                            R  

"R" can be a hydrogen atom or a hydrocarbon group (for example, an alkyl group). If "R" is hydrogen, then you have the primary alcohol ethanol, CH3CH2OH.

Ethanol is the only primary alcohol to give the triiodomethane (iodoform) reaction.

If "R" is a hydrocarbon group, then you have a secondary alcohol. Lots of secondary alcohols give this reaction, but those that do all have a methyl group attached to the carbon with the -OH group.

No tertiary alcohols can contain this group because no tertiary alcohols can have a hydrogen atom attached to the carbon with the -OH group. No tertiary alcohols give the triiodomethane (iodoform) reaction.