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General Organic Chemistry I: Electronic Effects
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Hyperconjugation
JEE Main level
Single correct option
Difficulty 2 of 3
g1127
Which of the following has the maximum number of hyperconjugative structures?
A
(
CH
X
3
)
X
2
C
=
CH
−
CH
X
3
(2-methylbut-2-ene)
B
CH
X
2
=
C
(
CH
X
3
)
−
CH
X
2
CH
X
3
(2-methylbut-1-ene)
C
(
CH
X
3
)
X
2
CH
−
CH
=
CH
X
2
(3-methylbut-1-ene)
D
CH
X
3
CH
X
2
CH
X
2
−
CH
=
CH
X
2
(pent-1-ene)
Answer: A
Alpha hydrogens: 2-methylbut-2-ene
3
+
3
+
3
=
9
; 2-methylbut-1-ene
3
+
2
=
5
; 3-methylbut-1-ene 1; pent-1-ene 2. So 2-methylbut-2-ene has the most.
Practice General Organic Chemistry I: Electronic Effects
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