Give reasons for the following :

(a) The presence of -NO_{2} group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution
reactions.

(b) p-dicholorobenzene has higher melting point than that of ortho or meta isomer.

(c) Thionyl chloride method is preferred for preparing alkyl chloride from alcohols.

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(1) Presence of nitro group at O- and p- positions increasesreactivity  of haloarness towards nucleophilic substitution reactions as they stabilize the intermidiate carbanion due to disposal of negative charge.

(2) p-dichlorobenzene has higher melting point than that of O- or m- isomer because it fits better in crystal lattice as compared to O- and m-. Hence due to symmetry.

(3) Thionyl chloride method is prefferred for preparing alkyl chloride from alcohols because by product formed are gases.

    CH_{3}OH+SOCl_{2}\rightarrow CH_{3}Cl+SO_{2}\uparrow+HCl\uparrow

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