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Byju's Answer
Standard XII
Chemistry
Dehydration of Alcohols
Which of the ...
Question
Which of the following alcohols on dehydration gives most stable carbocation?
A
C
H
3
−
C
H
|
C
H
3
−
C
H
2
O
H
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B
C
H
3
−
C
H
3
|
C
|
C
H
3
−
O
H
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C
C
H
3
−
C
H
2
−
C
H
2
−
O
H
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D
C
H
3
−
C
H
|
O
H
−
C
H
3
C
H
2
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Solution
The correct option is
B
C
H
3
−
C
H
3
|
C
|
C
H
3
−
O
H
C
H
3
−
C
H
3
|
C
|
C
H
3
−
O
H
→
C
H
3
−
+
C
|
C
H
3
−
C
H
3
Tertiary carbocation is more stable than secondary and primary carbocation.
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Similar questions
Q.
The order of reactivity of following alcohols with halogen acids is:
(A)
C
H
3
C
H
2
−
C
H
2
−
O
H
(B)
C
H
3
−
C
H
2
−
C
|
C
H
3
H
−
O
H
(C)
C
H
3
−
C
H
2
−
C
H
3
|
C
|
C
H
3
−
O
H
Q.
(A)
C
H
3
−
C
|
C
H
3
H
−
C
H
2
−
C
H
2
−
O
H
(B)
C
H
3
−
O
H
|
C
|
C
H
3
−
C
H
2
−
C
H
3
(C)
C
H
3
C
H
3
|
C
H
−
O
H
|
C
H
−
C
H
3
The order of given alkanols
A
,
B
,
C
in their reactivity towards acid catalysed dehydration is:
Q.
The correct reactivity order of alcohols towards
H
−
X
will be:
(I)
C
H
2
=
C
H
−
O
H
(II)
C
H
2
=
C
H
−
C
H
2
O
H
(III)
C
H
3
−
C
H
2
−
O
H
(IV)
C
H
3
−
C
H
|
O
H
−
C
H
3
Q.
Identify the type of the following reaction of carbon compounds.
a. CH
3
-CH
2
-CH
2
-OH → CH
3
-CH
2
-COOH
b. CH
3
-CH
2
-CH
3
→ 3CO
2
+ 4H
2
O
c. CH
3
-CH = CH -CH
3
+ Br
2
→ CH
3
-CHBr - CHBr -CH
3
d. CH
3
-CH
3
+ Cl
2
→ CH
3
-CH
2
-Cl + HCl
e. CH
3
-CH
2
-CH
2
-CH
2
-OH → CH
3
-CH
2
-CH=CH
2
+ H
2
O
f. CH
3
-CH
2
-COOH + NaOH → CH
3
-CH
2
-COO - Na
+
+ H
2
O
g. CH
3
-COOH + CH
3
-OH → CH
3
-COO- CH
3
+ H
2
O
Q.
Assertion :
C
H
3
C
H
3
|
|
C
H
3
−
C
−
C
H
2
−
B
r
+
N
a
O
H
⟶
C
H
3
−
C
−
C
H
2
−
C
H
3
|
|
C
H
3
O
H
Reason: It follows with formation of more stable carbocation.
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