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How many of the following alkyl halides ...

How many of the following alkyl halides CANNOT be prepared by Finkelstein reaction?
`CH_(3)(CH_(2))_(2)Cl, CH_(3)(CH_(2))_(3) Br, CH_(3)(CH_(2))_(3)I`
`CH_(3)CH(CH_(3))CH_(2)-Cl, PhCH_(2)Br, PhCH_(2)CH_(2)I`

Text Solution

Verified by Experts

The correct Answer is:
4
Only alkyl iodides can be prepared from corresponding alkyl chlorides and bromides by Finkelstein reaction.
`underset("halide iodide")underset("Alkyl Sodium")(R-X-NaI) overset("dry acetone")to underset("iodide halide")underset("Alkyl Sodium")(R-I+NaX)`
`(X=Cl, Br)`
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