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JEE CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

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Which of the following gives iodoform test?

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Correct option: A

\mathrm{C}{\mathrm{H}_3} - \mathrm{\;C}{\mathrm{H}_2}\mathrm{\;}\left( {\mathrm{OH}} \right)

The correct answer is A (

\mathrm{C}{\mathrm{H}_3} - \mathrm{\;C}{\mathrm{H}_2}\mathrm{\;}\left( {\mathrm{OH}} \right)

) because compounds with the

CH_3CH(OH)-

or

CH_3C(O)-

group give a positive iodoform test.

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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: