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Elimination Reactions of Alkyl Halides

Dehalogenatio...

Question

Dehalogenation of meso-2, 3-dibromo-butane results in

A

cis-2-Butene

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B

trans-2-Butene

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C

n-Butane

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D

A mixture of cis-and trans-2-Butene

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Solution

The correct option is B trans-2-Butene

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Similar questions

Q. Assertion :Addition of

B r_{2}

C C I_{4}

2

-butene gives a mesa form of

2, 3

-dibromo butane. Reason: The cyclic harmonium ion formed has a plane of symmetry.

Q. 1-halo-2,3-dimethyl butane will be obtained in better yields , if halogen is present at carbon number:

Q. Assertion :Mesons have mass more than electron whereas hyperons have mass more than protons. Reason: Mesons (short lived) on decomposition gives mesons, electrons, positrons, neutrinos, antineutrinos and

γ

-rays. Hyperons too are short lived on decay gives hyperons, mesons, neutrons and protons.

Q. Halogenation is a substitution reaction, where halogen replaces one or more hydrogens of hydrocarbon.
Chlorine free radical make

1^{\circ}, 2^{\circ}, 3^{\circ}

radicals with almost equal ease, whereas bromine free radicals have a clear preference for the formation of tertiary free radicals. So , bromine is less reactive, and more selective whereas chlorine is less selective and more effective.
The relative rate of abstraction of hydrogen by Br is

3^{\circ} (1600) > 2^{\circ} (82) > 1^{\circ} (1)

The relative rate of abstraction of hydrogen by Cl is

3^{\circ} (5) > 2^{\circ} (3.8) > 1^{\circ} (1)

A.1 -halo -2, 3 -dimethyl butane will be obtained in better yields, if halogen is :

Q. Sample of 2, 3-dibromo-3-methylpentane is heated with zinc dust. The resulting product is isolated and heated with HI in the presence of phosphorus. Indicate which is the structure that represent the final organic product formed in the reaction

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