Which of the following statements is correct for four isomeric bromobutanes?

Question

Which of the following statements is correct for four isomeric bromobutanes? (A) Of the two 1° bromides, the carbocation intermediate derived from ( CH 3)2 CHCH 2 Br is more stable than derived from CH 3 CH 2 CH 2 CH 2 Br (B) The electron donating effect of CH 3 CH 2 CH 2 CH 2-group is more than that of ( CH 3)2 CHCH 2- group (C) CH 3 CH 2 CH 2 CH 2 Br is more reactive than ( CH 3)2 CHCH 2 Br in S N 1 reactions (D) The decreasing order of SN 1 reaction is CH 3 CH 2 CH 2 CH 2 Br < ( CH 3)2 CHCH 2 Br < CH 3 CH 2 CH ( Br ) CH 3< ( CH 3)3 CBr

Tardigrade Admin · Accepted Answer

The electron donating effect of CH 3 CH 2 CH 2 CH 2-group is less than that of ( CH 3)2 CHCH 2-group. ( CH 3)2 CHCH 2 Br is more reactive than CH 3 CH 2 CH 2 CH 2 Br towards S N 1 reactions. The decreasing order of S N 1 reaction is ( CH 3)3 CBr > CH 3 CH 2 CH ( Br ) CH 3>( CH 3)2 CHCH 2 Br > CH 3 CH 2 CH 2 CH 2 Br The given, order is the increasing order.

Q. Which of the following statements is correct for four isomeric bromobutanes?

Of the two $1^{\circ}$ bromides, the carbocation intermediate derived from $(C H_{3})_{2} C H C H_{2} B r$ is more stable than derived from $C H_{3} C H_{2} C H_{2} C H_{2} B r$

The electron donating effect of $C H_{3} C H_{2} C H_{2} C H_{2}$ -group is more than that of $(C H_{3})_{2} C H C H_{2} -$ group

$C H_{3} C H_{2} C H_{2} C H_{2} B r$ is more reactive than $(C H_{3})_{2} C H C H_{2} B r$ in $S_{N} 1$ reactions

The decreasing order of $S_{N} 1$ reaction is $C H_{3} C H_{2} C H_{2} C H_{2} B r < (C H_{3})_{2} C H C H_{2} B r < C H_{3} C H_{2} C H (B r) C H_{3} < (C H_{3})_{3} CB r$

Q. Which of the following statements is correct for four isomeric bromobutanes?

Of the two 1∘ bromides, the carbocation intermediate derived from (CH3​)2​CHCH2​Br is more stable than derived from CH3​CH2​CH2​CH2​Br

The electron donating effect of CH3​CH2​CH2​CH2​-group is more than that of (CH3​)2​CHCH2​− group

CH3​CH2​CH2​CH2​Br is more reactive than (CH3​)2​CHCH2​Br in SN​1 reactions

The decreasing order of SN​1 reaction is CH3​CH2​CH2​CH2​Br<(CH3​)2​CHCH2​Br<CH3​CH2​CH(Br)CH3​<(CH3​)3​CBr

Of the two $1^{\circ}$ bromides, the carbocation intermediate derived from $(C H_{3})_{2} C H C H_{2} B r$ is more stable than derived from $C H_{3} C H_{2} C H_{2} C H_{2} B r$

The electron donating effect of $C H_{3} C H_{2} C H_{2} C H_{2}$ -group is more than that of $(C H_{3})_{2} C H C H_{2} -$ group

$C H_{3} C H_{2} C H_{2} C H_{2} B r$ is more reactive than $(C H_{3})_{2} C H C H_{2} B r$ in $S_{N} 1$ reactions

The decreasing order of $S_{N} 1$ reaction is $C H_{3} C H_{2} C H_{2} C H_{2} B r < (C H_{3})_{2} C H C H_{2} B r < C H_{3} C H_{2} C H (B r) C H_{3} < (C H_{3})_{3} CB r$