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  • Which of the following is a halogen exchange reaction?

Which of the following is a halogen exchange reaction?

(i)RX+NaI\rightarrow RI+NaX

(ii) 

(iii) R-OH+HX\overset{ZnCl_{2}}{\rightarrow} R-X+H_{2}O

(iv) 

Answers (1)

A halogen exchange reaction is a chemical reaction where one halide ion replaces another halide ion in a compound. The general format for a halogen exchange reaction is:

  • X1 and X2: Different halogens
  • Na: A sodium ion 
  • R−X1+NaX2→R−X2+NaX1
  • R: An organic group

Some examples of halogen exchange reactions include:

  • Finkelstein reaction: A halogen (-X) is replaced by iodine. This reaction is also known as the halex reaction.
  • Addition of hydrogen halide on alkene: Hydrogen halide is added to an alkene.
  • Halogen replaces the alcoholic group: A halogen replaces an alcoholic group.
  • Halogen replaces the hydrogen of the benzene ring: A halogen replaces the hydrogen of a benzene ring. 

The reactivity of the halogen group decreases from top to bottom within the group. Fluorine is the most reactive halogen, while iodine is the least. 

This reaction is also called the Finkelstein reaction.

Hence, the correct option is (i).

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infoexpert21

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