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JEE CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

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Understanding +4 | -1

Although chlorobenzene does not give Ulmann’s reaction. However, presence of…group in chlorobenzene at

o - ,p -

position enables it to give Ulmann’s reaction.

View answer and explanation

Correct option: A

\mathrm{N}{\mathrm{O}_2}

Option A (

\mathrm{N}{\mathrm{O}_2}

) is correct because the presence of electron-withdrawing groups like nitro (

\mathrm{N}{\mathrm{O}_2}

) at ortho- and para- positions activates the chlorobenzene towards nucleophilic substitution in Ullmann's reaction.

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An alkyl halide reacts with metallic sodium in dry ether. The reaction is known as : In electrophilic substitution reaction of chlorobenzene, the chloro group: Which of the followings statements is/are incorrect? Polymerization of alkenes takes place through Assertion (A): The boiling points of alkyl halides decrease in the order:

RI > {R B r} > {R C I} > {R F}

.

Reason (R): The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass. Friedel-Craft’s reaction of bromobenzene with methyl iodide gives: