Which of the following reactions will yield 2, 2-dibromopropane ?

Question

Which of the following reactions will yield 2, 2-dibromopropane ? (A) CH 3- CH = CH 2+ HBr (B) CH 3- C ≡ CH +2 HBr (C) CH 3- CH = CHBr + HBr (D) CH ≡ CH +2 HBr

Tardigrade Admin · Accepted Answer

Reaction of propyne with 2 molecules of HBr to form 2,2 -dibromo propane can be written as:

< b r / > C H_{3} - C \equiv C H + 2 H B r \to C H_{3} - C (B r) = C H_{2} < b r / >

< b r / > C H_{3} - C (B r) = C H_{2} + H B r \to C H_{3} - C (B r)_{2} - C H_{3} < b r / >

The reaction follows Markownikoff's rule.

Q. Which of the following reactions will yield $2, 2$ -dibromopropane ?

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

$C H_{3} - C \equiv C H + 2 H B r$

$C H_{3} - C H = C H B r + H B r$

$C H \equiv C H + 2 H B r$

Q. Which of the following reactions will yield 2,2-dibromopropane ?

CH3​−CH=CH2​+HBr

CH3​−C≡CH+2HBr

CH3​−CH=CHBr+HBr

CH≡CH+2HBr

Reaction of propyne with 2 molecules of HBr to form 2,2 -dibromo propane can be written as: <br/>CH3​−C≡CH+2HBr→CH3​−C(Br)=CH2​<br/> <br/>CH3​−C(Br)=CH2​+HBr→CH3​−C(Br)2​−CH3​<br/> The reaction follows Markownikoff's rule.

Q. Which of the following reactions will yield $2, 2$ -dibromopropane ?

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

$C H_{3} - C \equiv C H + 2 H B r$

$C H_{3} - C H = C H B r + H B r$

$C H \equiv C H + 2 H B r$