Question

(b)2,4,6-trinitro chloro benzene is more reactive than chloro benzene towards SN reaction with aqueous
NaOH solution.
(c)Write Flokelsteins reaction​

Answer 1

Explanation:

The presence of electron withdrawing groups such as NO2, CN etc., at ortho and para positions increase the reactivity of haloarenes.

Answer 2

Answer:

chlorobenzene is less reactive towards SN / nucleophilic substitution reaction.

in chlorobenzene the carbon atom to which halogen atom is attached sp² hybridized and highly electronegative in nature so it cannot be replaced by a nucleophile.  

another reason, the activation energy, the chlorobenzene the lone pair of electrons on halogen atom is delocalized on the benzene ring .the  resonance is more stable.  

Finkelstein reaction:-  

the reaction which is used by for alkyl halide in exchanging into another alkyl halide with the help of halide salt.  

mechanism of this reaction is a single step that means SN² reaction mechanism.

the stereochemistry is inversion.

the factors which are important for this reaction are  

• nucleophilicity.

• nature of the group.  

• alkyl halogen bond.

• carbon halogen bond.

the reaction is more suitable for generally for primary halides and ∝-carbonyl halides and allyl benzyl.