In which of the following will Kharasch effect operate?

{C H}_{3} - {C H}_{2} - C H = {C H}_{2} + H C l

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{C H}_{3} - {C H}_{2} - C H = {C H}_{2} + H B r

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{C H}_{3} - C H = C H - {C H}_{3} + H B r

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{C H}_{3} - {C H}_{2} - C H = {C H}_{2} + H I

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Solution

The correct option is B ${C H}_{3} - {C H}_{2} - C H = {C H}_{2} + H B r$
In presence of peroxide the addition of HBr to unsymmetrical alkenes takes place contrary to Markovnikov's rule (Kharasch effect)
$C H_{3} C H_{2} C H = C H_{2} + H B r \to C H_{3} C H_{2} C H_{3} C H_{2} B r$
Option B is correct.

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Similar questions

Q. Pick out the correct reactions:

A . C H_{3} - C H = C H_{2} + H C l ⟶ C H_{3} - C | C l H - C H_{3}

B . C H_{3} - C H = C H_{2} + H B r ⟶ C H_{3} - C H_{2} - C H_{2} B r

C . C H_{3} - C H = C H_{2} + H B r p e r o x i d e - ---- \to C H_{3} - C H_{2} - C H_{2} - B r

D . C H_{3} - C H = C H_{2} + H I p e r o x i d e - ---- \to C H_{3} - C | I H - C H_{3}

C H_{3} - C H_{2} - C H = C H - C H_{2} - C H_{3} + H B r \to

Q. Complete table.

Chemical reaction	Product	$I U P A C$ name of the product
$C H_{2} = C H_{2} + C l_{2}$	........	........
$C H_{2} = C H_{2} + H C l$	..........	.........
$C H_{3} - C h = C H_{2} + H_{2}$	..........	..........
$C H_{3} - C H = C H - C H_{3} + H B r$	...........	........

Which are free radical reactions

$I . C H_{3} - C H = C H_{2} + H B r P e r o x i d e - ---- \to C H_{3} - C H_{2} - C H_{2} B r I I . C H_{3} - C H = C H_{2} + H B r \to C H_{3} - C H B r - C H_{3} I I I . C H_{3} - C H = C H_{2} + C l_{2} \to C l C H_{2} - C H = C H_{2} I V . C H_{3} - C H_{3} + C l_{2} \to C l C H_{2} - C H_{3}$

Q. Which will undergo reaction with ammonical

A g N O_{3}

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In which of the following will Kharasch effect operate?

The correct option is B CH3−CH2−CH=CH2+HBrIn presence of peroxide the addition of HBr to unsymmetrical alkenes takes place contrary to Markovnikov's rule (Kharasch effect)CH3CH2CH=CH2+HBr→CH3CH2CH3CH2BrOption B is correct.