Question
The electrophile, $${E^ \oplus }$$ attacks the benzene ring to generate the intermediate $$\sigma - $$ complex. Of the following, which $$\sigma - $$ complex is lowest energy ?
A.
B.
C.
D.
Answer :
Solution :
In option (B) the complex formed is with benzene where as in other cases it is formed with nitrobenzene with - $$N{O_2}$$ group in different position $$\left( {o - ,m - ,p - } \right).$$ The complex formed with nitrobenzene in any position of $$ - N{O_2}$$ group is less stable than the complex formed with benzene so the correct answer is (B)
NOTE : The most stable complex has lowest energy.
In option (B) the complex formed is with benzene where as in other cases it is formed with nitrobenzene with - $$N{O_2}$$ group in different position $$\left( {o - ,m - ,p - } \right).$$ The complex formed with nitrobenzene in any position of $$ - N{O_2}$$ group is less stable than the complex formed with benzene so the correct answer is (B)
NOTE : The most stable complex has lowest energy.