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  4. The following reaction R - Cl + NaI xrightarrow textAcetone R - I + NaCl is known as

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Q. The following reaction
$ R - Cl + NaI \xrightarrow{\text{Acetone}} R - I + NaCl $
is known as

AMUAMU 2016Haloalkanes and Haloarenes

Solution:

$R -X + NaI \xrightarrow{\text{Acetone}} R - I +NaX$ ,br> where $X = Cl, Br$
Alkyl iodides are often prepared by alkyl chlorides/bromides by heating with $NaI$ in dry acetone. This reaction is known as Finkelstein reaction. $NaCl$ or $NaBr$ thus formed is precipitated in dry acetone.