Which of the following organic chlorides will not give a Friedel - Craft alkylation product when heated with benzene and $A l C l_{3}$ ?

(C H_{3})_{3} C C l

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C H_{2} = C H C H_{2} C l

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C H_{3} C H_{2} C l

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C H_{2} = C H C l

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Solution

The correct option is C $C H_{2} = C H C H_{2} C l$
Only alpha carbon atoms give this Friedel crafts reaction i.e. the halogen atom like chloride or bromide should be attached to carbon next to double bond. In B halogen atom is not present adjacent to carbon with double bond.

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