Q.

Column I Reactions Column II Mechanism

a p Vinylic radical

b q Radical anion

c r trans-Vinylic anion

d s Concerted mechanism

Column I Reactions
a	p	Vinylic radical
b	q	Radical anion
c	r	trans-Vinylic anion
d	s	Concerted mechanism

Alcohols Phenols and Ethers Report Error

$( a \rightarrow q ; b \rightarrow p , q , r ; c \rightarrow s ; d \rightarrow s )$

$( a \rightarrow s ; b \rightarrow p , q , r ; c \rightarrow q ; d \rightarrow s )$

$( a \rightarrow p ; b \rightarrow s, q , r ; c \rightarrow q ; d \rightarrow r )$

$( a \rightarrow r ; b \rightarrow s, q , p ; c \rightarrow s ; d \rightarrow q )$

Solution:

$( a \rightarrow q ; b \rightarrow p , q , r ; c \rightarrow s ; d \rightarrow s )$
a. It is pinacol formation which proceeds by radical anion.
b. It is Birch reduction which proceeds by the formation

c. It is an example of Claisen rearrangement reaction and proceeds by concerted mechanism.
d. It is an example of Diels-Alder reaction and proceeds by concerted mechanism.

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$ E _{ Mn ^{2+} / MnO _{4}^{-}}^{\circ}=-1.510\, V$
$\frac{1}{2} O _{2}+2 H ^{+}+2 e ^{-} \rightarrow H _{2} O ,$
$ E _{ O _{2} / H _{2} O }^{\circ}=+1.223 \,V$
Will the permanganate ion, $MnO _{4}^{-}$liberate $O _{2}$ from water in the presence of an acid ?

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the number of sigma(s) bonds present in the product A is :-

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Q. Column I Reactions Column II Mechanism a p Vinylic radical b q Radical anion c r trans-Vinylic anion d s Concerted mechanism