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Byju's Answer
Standard XII
Chemistry
Preparation of Alcohols from Grignard Reagents
What sequence...
Question
What sequence of steps represents the best synthesis of 4-heptanol
(
C
H
3
C
H
2
C
H
2
)
2
C
H
O
H
?
A
C
H
3
C
H
2
C
H
2
M
g
B
r
(2 moles) + formaldehyde (
H
2
C
=
O
) in diethyl ether followed by
H
3
O
+
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B
C
H
3
C
H
2
C
H
2
M
g
B
r
+ butanal (
C
H
3
C
H
2
C
H
2
C
H
=
O
) in diethyl ether followed by
H
3
O
+
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C
C
H
3
C
H
2
C
H
2
M
g
B
r
+ acetone
[
(
C
H
3
)
2
C
=
O
) in diethyl ether followed by
H
3
O
+
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D
(
C
H
3
C
H
2
C
H
2
)
2
C
H
M
g
B
r
+ formaldehyde (
H
2
C
=
O
) in diethyl ether followed by
H
3
O
+
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Solution
The correct option is
B
C
H
3
C
H
2
C
H
2
M
g
B
r
+ butanal (
C
H
3
C
H
2
C
H
2
C
H
=
O
) in diethyl ether followed by
H
3
O
+
O
(A)
C
H
3
C
H
2
C
H
2
M
g
B
r
+
H
|
|
C
H
⟶
C
H
3
C
H
2
C
H
2
C
H
2
O
M
g
B
r
↓
H
3
O
+
C
H
3
C
H
2
C
H
3
+
C
H
3
C
H
2
C
H
2
C
H
2
O
H
(
i
)
C
H
3
C
H
2
C
H
2
M
g
B
r
−
−−−−−−−−−−−−
→
(
i
i
)
H
+
C
H
3
C
H
2
C
H
2
C
H
2
O
H
[Acid base reaction]
(B)
C
H
3
C
H
2
C
H
2
M
g
B
r
(
i
)
C
H
3
C
H
2
C
H
2
C
H
O
−
−−−−−−−−−−−−
→
(
i
i
)
H
3
O
+
C
H
3
C
H
2
C
H
2
−
C
H
|
−
O
H
C
H
3
C
H
2
C
H
2
4
−
h
e
p
t
a
n
o
l
O
C
H
3
(C)
C
H
3
C
H
2
C
H
2
M
g
B
r
(
i
)
H
3
C
|
|
C
C
H
3
−
−−−−−−−
→
(
i
i
)
H
3
O
+
C
H
3
C
H
2
C
H
2
−
|
C
|
−
O
H
C
H
3
2
−
M
e
t
h
y
l
−
2
−
p
e
n
t
a
n
o
l
(D)
(
C
H
3
C
H
2
C
H
2
)
2
C
H
M
g
B
r
(
i
)
C
H
2
=
O
−
−−−−−
→
(
i
i
)
H
3
O
+
C
H
3
−
C
H
2
−
C
H
2
−
C
|
−
C
H
−
C
H
2
O
H
H
3
C
H
2
C
C
H
2
Therefore the reaction B only gives our desired product
4
−
h
e
p
t
a
n
o
l
. All the reactions involve treatment of Grignard reagent with carbonyl compounds giving alcohol after hydrolysis.
Suggest Corrections
0
Similar questions
Q.
i
)
C
H
3
−
C
H
2
−
C
H
3
|
C
H
−
C
H
2
−
O
=
C
H
2
−
C
H
3
i
i
)
C
H
3
−
C
H
2
−
C
H
2
−
O
−
C
H
3
|
C
|
C
H
3
−
C
H
3
Give the major products that are formed by heating each of the following ethers with HI.
Q.
Which of the following is position isomer of
C
H
3
−
C
H
2
−
O
|
|
C
−
C
H
2
−
C
H
3
?