Predict a dihalide which gives ethene by treating with Zn dust under suitable conditions.

2,4-dibromo-3-methylpentane

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1,2-dibromoethane

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1,4-dibromomethylpentane

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1,3-dibromo-2-methylbutane

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Solution

The correct option is B 1,2-dibromoethane
Zn dust brings dehalogenation of vicinal dihalide to give alkene.
among the given option only 1,2-dibromoethane is vicinal dihalide thus it will undergo dehalogenation.
$C H_{2} | B r - C H_{2} | B r Z n ⟶ C H_{2} = C H_{2}$
All others are not vicinal dihalide thus they donot undergo dehalogenation.
Hence correct option is b.

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