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JEE CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

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CH _3 CH _2- CH = CH _2 \xrightarrow{\text { NBS }} \underset{\text { One of the product }}{( X )} \xrightarrow{\text { alc. } KOH }( Y )

The compound

( Y )

is

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Correct option: C

1,3-Butadiene

Option C (1,3-Butadiene) is correct because NBS promotes allylic bromination followed by elimination with alc. KOH to form a conjugated diene.

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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: