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Dehalogenation of Vicinal Dihalide

The process t...

Question

The process through conversion of 2,3-dibromobutane to 2-butene with Zn dust takes place:

A

Dehydrogenation

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B

Dehydrohalogenation

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C

Dehalogenation

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D

Denaturation

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Solution

The correct option is C Dehalogenation
Zn dust brings dehalogenation of 2,3−Dibromopentane to give but−2−ene
$C H_{3} - B r | C | H - B r | C | H - C H_{3} Z n / d u s t - ---- \to △ C H_{3} - C H = C H - C H_{3}$

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Similar questions

Q. The conversion of 2,3-dibromobutane to 2-butene with

Z n

Assertion : Addition of bromine to trans-2-butene yields meso-2, 3-dibromobutane

Reason : Bromine addition to an alkene is an electrophilic addition.

Q. The major products obtained during ozonolysis of

2, 3 - d i m e t h y l - 1 - b u t e n e

and subsequent reductions with

Z n

H_{2} O

It is given that when (±)-2,3-dibromobutane reacts with $K O H$ , some of the products formed are:

Explain via mechanism and then choose the correct ones from the following.

Monosubstitution of (2S,3S)-2,3-dibromobutane using $O H^{-}$ yields a mixture of products.
Monosubstitution of (2S,3S)-2,3-dibromobutane using $O H^{-}$ yields a single major product.
Monosubstitution of (2R,3R)-2,3-dibromobutane using $O H^{-}$ yields a mixture of products.
Monosubstitution of (2S,3S)-2,3-dibromobutane using $O H^{-}$ yields a mixture of products.

Q. Assertion : Cis-But-2-ene and trans-but-2-ene on reaction with

B r_{2}

C C l_{4}

gives meso-2,3-dibromobutane and (dl) 2,3-dibromobutane respectively.
Reason : Addition of

B r_{2}

on double bond involved anti addition.

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Dehalogenation of Vicinal Dihalide

Standard XII Chemistry

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