Regarding Finkelstein reaction, false statement is

$\mathrm{R}-\mathrm{Cl}+\mathrm{NaI}\underset{{\mathrm{SN}}_2}{\overset{\mathrm{acetone}}{\to }}\mathrm{R}-\mathrm{I}+\mathrm{NaCl}.$

NaCl is more ionic than NaI. Solubility of NaCl in acetone is lesser than NaI. Thus NaCl can be removed easily and the reaction proceeds in forward direction.