JEE CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

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Assertion (A): Chlorine is an ortho-para directing group in electrophilic aromatic substitution reaction.

Reason (R): Chlorine is an electron withdrawing group.

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Correct option: B

Both A and R are correct; R is not the correct explanation of A

Option B is correct because chlorine is an ortho-para directing group due to resonance (+R effect), and it's also an electron-withdrawing group due to its electronegativity (-I effect), but the electron-withdrawing nature doesn't explain its directing effect.

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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}

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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: