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Byju's Answer
Standard XII
Chemistry
Resonance Effect
Which will be...
Question
Which will be the least stable resonating structure?
A
C
H
2
=
C
H
−
⊕
C
H
−
⊝
C
H
−
O
−
C
H
3
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B
Θ
C
H
2
−
⊕
C
H
−
C
H
=
C
H
−
O
C
H
3
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C
Θ
C
H
2
−
C
H
=
C
H
−
C
H
=
⊕
O
−
C
H
3
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D
C
H
2
=
C
H
−
⊝
C
H
−
C
H
=
⊕
O
−
C
H
3
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Solution
The correct option is
C
Θ
C
H
2
−
C
H
=
C
H
−
C
H
=
⊕
O
−
C
H
3
Θ
C
H
2
−
C
H
=
C
H
−
C
H
=
⊕
O
−
C
H
3
will be most unstable as:
i) It has maximum charge separation.
ii) positive charge on
O
in unstable.
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1
Similar questions
Q.
I
.
⊖
C
H
2
−
⊕
C
H
−
C
H
=
C
H
−
O
−
C
H
3
I
I
.
⊖
C
H
2
−
C
H
=
C
H
−
⊕
C
H
−
O
−
C
H
3
I
I
I
.
C
H
2
=
C
H
−
⊖
C
H
−
⊕
C
H
−
O
−
C
H
3
I
V
.
C
H
2
=
C
H
−
⊖
C
H
−
C
H
=
⊕
O
−
C
H
3
C
H
2
=
C
H
−
C
H
=
C
H
−
O
−
C
H
3
has the following above resonating structures.
The correct order of stability of these resonating structures is:
Q.
Which will undergo reaction with ammonical
A
g
N
O
3
?
Q.
Which of the following lone-pair indicated is not involved in resonance?
(A)
C
H
2
=
C
H
−
.
.
N
H
−
C
H
3
(B)
C
H
2
=
C
H
−
.
.
O
.
.
−
C
H
3
(C)
C
H
2
=
C
H
−
.
.
O
.
.
−
C
H
=
C
H
2
(D)
C
H
2
=
C
H
−
N
H
2
Q.
Which is the most suitable reagent for the following conversion?
C
H
3
−
C
H
=
C
H
−
C
H
2
−
O
|
|
C
−
C
H
3
→
C
H
3
−
C
H
=
C
H
−
C
H
2
−
O
|
|
C
−
O
H
Q.
Pick out the correct reactions:
A
.
C
H
3
−
C
H
=
C
H
2
+
H
C
l
⟶
C
H
3
−
C
|
C
l
H
−
C
H
3
B
.
C
H
3
−
C
H
=
C
H
2
+
H
B
r
⟶
C
H
3
−
C
H
2
−
C
H
2
B
r
C
.
C
H
3
−
C
H
=
C
H
2
+
H
B
r
p
e
r
o
x
i
d
e
−
−−−−
→
C
H
3
−
C
H
2
−
C
H
2
−
B
r
D
.
C
H
3
−
C
H
=
C
H
2
+
H
I
p
e
r
o
x
i
d
e
−
−−−−
→
C
H
3
−
C
|
I
H
−
C
H
3
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