Tardigrade
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Tardigrade
Question
Chemistry
Arrange the following organic halides in correct order of reactivity towards SN2 displacement. underset text (P)(CH3)2 C(Br)CH2CH3 , underset text (Q)Br CH2 (CH2)3 CH3 , underset text (R)CH3CH (Br)(CH2)2 CH3
Q. Arrange the following organic halides in correct order of reactivity towards
S
N
2
displacement.
(P)
(
CH
X
3
)
X
2
C
(
Br
)
CH
X
2
CH
X
3
,
(Q)
Br
CH
X
2
(
CH
X
2
)
X
3
CH
X
3
,
(R)
CH
X
3
CH
(
Br
)
(
CH
X
2
)
X
2
CH
X
3
1618
173
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AP EAMCET 2019
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A
P > Q > R
50%
B
R > P >Q
0%
C
P > R > Q
0%
D
Q > R > P
50%
Solution:
3
∘
alkyl halide (highly sterically hindered)
1
∘
alkyl halide (least sterically hindered)
(
R
)
2
∘
alkyl halide
Rate of
S
N
2
reaction
∝
sterically hindrance
1
∴
Rate is
1
∘
>
2
∘
>
3
∘
alkyl halide.
Hence,
Q
>
R
>
P
is correct answer.