JEE CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

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Assertion (A):

\mathrm{KCN}

react with

\mathrm{R}-\mathrm{X}

to give cyanide and

\mathrm{AgCN}

reacts with

\mathrm{R}-\mathrm{X}

to give isocyanide mainly.
Reason (R):

\mathrm{KCN}

and

\mathrm{AgCN}

both are ionic compounds

View answer and explanation

Correct option: C

Assertion is true and Reason is false

Option C (Assertion is true and Reason is false) is correct because KCN is predominantly ionic and attacks through carbon, while AgCN is more covalent and attacks through nitrogen. The reason incorrectly states that both are ionic.

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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: