The reaction of $1$ -butene with HBr in presence peroxides yields $1$ -bromobutane. The mechanism of reaction involves:

isomerization of the

2 -

bromobutane produced initially

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attack on the alkene by the bromine atom, Br

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attack on the butene by

B r^{+}

ion

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attack on the alkene by a

H^{+}

ion

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Solution

The correct option is B attack on the alkene by the bromine atom, Br
Chain propagation
$C H_{3} C H_{2} C H = C H_{2} + | ¯ ¯¯¯¯¯ ¯ B r - - - \cdot ⟶ C H_{3} C H_{2} ˙ C H - C H_{2} B r s e c o n d a r y r a d i c a l$ $Δ H^{o} \sim - 12.6 k J / m o l$
$C H_{3} C H_{2} ˙ C H - C H_{2} B r s e c o n d a r y r a d i c a l + H B r ⟶ C H_{3} C H_{2} H | C H - C H_{2} B r + | ¯ ¯¯¯¯¯ ¯ B r - - - \cdot$ $Δ H^{o} \sim - 31.4 k J / m o l$
The reaction follows free radical mechanism and bromine radical is involved in the first step at propagation. Presence of peroxide first produce bromine radical.

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Similar questions

Q. Assertion :

2

-Bromobutane on reaction with sodium ethoxide in ethanol gives

1

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In the following questions two Statement-1 (Assertion) and Statement-2 (Reason) are provided. Each questions has 4 choices (a), (b), (c) and (d) for its answer, out of which ONLY ONE is correct. Mark your responses from the following options:
Statement- 1: 1-Butene on reaction with HBr in the presence of a peroxide produces 1-bromobutane.
Statement- 2: It involves the formation of a primary radical.

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:

Q. Statement-I : 1-Butene on reaction with HBr in the presence of a peroxide produces 1-bromobutane.
Because
Statement-II : It involves the formation of a primary radical.

Q. The reaction of

1

-hexene with

H B r

in presence of peroxide yields

1

-bromo cyclohexane. The mechanism of the reaction involves :

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The reaction of 1-butene with HBr in presence peroxides yields 1-bromobutane. The mechanism of reaction involves:

The reaction of $1$ -butene with HBr in presence peroxides yields $1$ -bromobutane. The mechanism of reaction involves: