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Catalytic Hydrogenation of Aromatics

1,3 Butadiene...

Question

1,3 Butadiene on reaction with HBr/water gives primarily 3 bromo 1 butene at high temperatures. Give the reaction.

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Solution

1,4 addition is more preferred at high temperatures.- Kinetically favoured product. Thus the reaction takes place with the addition of Br group to the carbon number 3.

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Similar questions

Q. Reaction of one molecule of

H B r

with one molecule of 1, 3-Butadiene at

40^{\circ} c

gives predominantly:

Q. The reaction of one molecule of

H B r

with one molecule of

1, 3 -

40^{\circ} C

gives predominantly:

Q. Reaction of one molecule of

H B r

with one molecule of 1, 3-Butadiene at

40^{\circ} c

gives predominantly:

Q. Assertion :Addition of one equivalent of

H C l

to 1,3-butadiene at

80^{o} C

gives 3-chloro-1-butene as major product. Reason: 3-chloro-1-butene is a kinetically controlled product.

Read the above assertion and reason and choose the correct option regarding it.

1 - B u t e n e + H B r H_{2} O_{2} - -- \to h ν 1 - B r o m o B u t a n e

The above reaction follows:

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