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Byju's Answer
Standard XII
Chemistry
Hydrogenation of Alkynes
31. Which of ...
Question
31. Which of the following carbocation is highly unstable? 1) CH2= CH -- CH2+ 2) CH3 -- CH+ -- CH3 3) CH3 -- C+ =O 4) CH2+ -- CH =O
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Q.
In which of the following pairs of carbocations, the first carbocation is more stable than the second?
(i)
C
H
2
=
C
H
−
+
C
H
2
and
C
H
2
=
C
H
−
C
H
2
−
+
C
H
2
(ii)
C
H
3
−
N
H
−
+
C
H
2
and
+
C
H
2
−
O
H
(iii)
C
H
3
−
O
−
C
H
2
−
+
C
H
2
and
C
H
2
−
O
−
+
C
H
2
(iv)
C
H
3
−
+
C
H
−
C
H
2
C
H
2
C
H
3
and
C
H
3
C
H
2
−
+
C
H
−
C
H
2
C
H
3
Q.
Write IUPAC names of the following
@CH3-CH2-CH=CH2
@CH3-CH2-CH2-C(CH3)2-CH3
@CH3-CH2-CHO
@CH3-CH(OH)-CH3
@CH3-CH2-CH2-COOH
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.
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.
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:
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