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Byju's Answer
Standard XII
Chemistry
Physical Properties of Alkenes
If a mixture ...
Question
If a mixture containing
1
−
b
u
t
e
n
e
,
c
i
s
−
2
−
b
u
t
e
n
e
and
t
r
a
n
s
−
2
−
b
u
t
e
n
e
is treated with peracid, how many different isomers of epoxides result?
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Solution
1-Butene on epoxidation will give 2 enantiomers.
If a mixture containing
1
−
b
u
t
e
n
e
,
c
i
s
−
2
−
b
u
t
e
n
e
and
t
r
a
n
s
−
2
−
b
u
t
e
n
e
is treated with perbenzoic acid, five different isomers of epoxides result.
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Similar questions
Q.
If trans-2-butene is treated with
B
r
2
−
H
2
O
containing some
N
a
C
l
and
A
l
C
l
3
, how many different dihalides (including stereoisomers)would result?
Q.
A mixture of
1
-butene (1 equivalent) and trans-
2
-butene (1 equivalent) reacts with 2 equivalents of HCl. If there are no carbocation rearrangements, how many different monochlordes, including stereoisomers, will form?
Q.
(i) Cis - 2 - butene
→
trans-2-butene,
△
H
1
(ii) Cis - 2 - butene
→
1 - butene,
△
H
2
(iii) Trans-2-butene is more stable than cis - 2 - butene.
(iv) Enthalpy of combustion of 1 - butene,
△
H
=
−
649.8
k
c
a
l
/
m
o
l
(v)
9
△
H
1
+
5
△
H
2
=
0
(vi) Enthalpy of combustion of trans 2 - butene,
△
H
=
−
647.0
k
c
a
l
/
m
o
l
.
The value of
△
H
1
and
△
H
2
in kcal/mol are
Q.
Cis-
2
-butene and trans-
2
-butene are :
Q.
(i) Cis - 2 - butene
→
trans-2-butene,
△
H
1
(ii) Cis - 2 - butene
→
1 - butene,
△
H
2
(iii) Trans-2-butene is more stable than cis - 2 - butene.
(iv) Enthalpy of combustion of 1 - butene,
△
H
=
−
649.8
k
c
a
l
/
m
o
l
(v)
9
△
H
1
+
5
△
H
2
=
0
(vi) Enthalpy of combustion of trans 2 - butene,
△
H
=
−
647.0
k
c
a
l
/
m
o
l
.
The value of
△
H
1
and
△
H
2
in kcal/mol are
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