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Identify the incorrect statement among the following:

1. Ethyl chloride, when reduced with a Zn–Cu couple in alcohol, yields ethane.
2. Methyl magnesium bromide reacts with acetone to produce butan-2-ol.
3. In reactions with alkenes, alkyl halides show the order of reactivity R–I > R–Br > R–Cl > R–I.
4. C2H4Cl2 can be found in two structural isomeric forms.

Correct answer: Methyl magnesium bromide reacts with acetone to produce butan-2-ol.

Solution

The statement is incorrect because methyl magnesium bromide (a Grignard reagent) reacts with acetone to produce 2-propanol, not butan-2-ol, as the reaction involves the addition of the methyl group to the carbonyl carbon of acetone.

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