question_answer

Directions: (Q. 21 to 25)

Case V: Read the passage given below and answer the following questions.

Haloarenes are less reactive than haloalkanes.

The low reactivity ofhaloarenes can be attributed to

- resonance effect

- \[s{{p}^{2}}\] hybridisation of C-X bond

- polarity of C-X bond

- instability of phenyl cation (formed by self- ionisation of haloarene)

- repulsion between the electron rich attacking nucleophiles and electron rich arenes.

Reactivity of haloarenes can be increased or decreased by the presence of certain groups at certain positions for example, nitro \[\left( -N{{O}_{2}} \right)\]group at o/p positions increases the reactivity of haloarenes towards nucleophilc substitution reactions.

Aryl halides are less reactive towards nucleophilic substitution reaction as compared to alkyl halides due to

A) the formation of less stable carbonium ion

B) resonance stabilization

C) larger carbon-halogen bond

D) inductive effect.