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JEE CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

1 Easy

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Understanding +4 | -1

Which among

\mathrm{MeX}, \mathrm{RCH}_2 \mathrm{X}, \mathrm{R}_2 \mathrm{CHX}

and

\mathrm{R}_3 \mathrm{CX}

is most reactive towards

\mathrm{S}_{\mathrm{N}} 2

reaction?

View answer and explanation

Correct option: A

\mathrm{MeX}

Option A (

\mathrm{MeX}

) is correct because it experiences the least steric hindrance, making it the most reactive in

S_N2

reactions.

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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: