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87
MCQ (Single Correct Answer)

Assertion (A) Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.

Reason (R) Phosphorus chlorides give pure alkyl halides.

A
Assertion and reason both are correct and reason is correct explanation of assertion.
B
Assertion and reason both are wrong statements.
C
Assertion is correct but reason is wrong statement.
D
Assertion is wrong but reason is correct statement.
E
Assertion and reason both are correct statements but reason is not correct explanation of assertion.
88
MCQ (Single Correct Answer)

Assertion (A) The boiling points of alkyl halides decrease in the order $\mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}$

Reason (R) The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.

A
Assertion and reason both are correct and reason is correct explanation of assertion.
B
Assertion and reason both are wrong statements.
C
Assertion is correct but reason is wrong statement.
D
Assertion is wrong but reason is correct statement.
E
Assertion and reason both are correct statements but reason is not correct explanation of assertion.
89
MCQ (Single Correct Answer)

Assertion (A) KCN reacts with methyl chloride to give methyl isocyanide.

Reason (R) $\mathrm{CN}^{-}$is an ambident nucleophile.

A
Assertion and reason both are correct and reason is correct explanation of assertion.
B
Assertion and reason both are wrong statements.
C
Assertion is correct but reason is wrong statement.
D
Assertion is wrong but reason is correct statement.
E
Assertion and reason both are correct statements but reason is not correct explanation of assertion.
90
MCQ (Single Correct Answer)

Assertion (A) tert-butyl bromide undergoes Wurtz reaction to give 2,2,3,3-tetramethylbutane.

Reason (R) In Wurtz reaction, alkyl halides react with sodium in dry ether to give hydrocarbon containing double the number of carbon atoms present in the halide.

A
Assertion and reason both are correct and reason is correct explanation of assertion.
B
Assertion and reason both are wrong statements.
C
Assertion is correct but reason is wrong statement.
D
Assertion is wrong but reason is correct statement.
E
Assertion and reason both are correct statements but reason is not correct explanation of assertion.
91
MCQ (Single Correct Answer)

Assertion (A) Presence of a nitro group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution.

Reason (R) Nitro group, being an electron withdrawing group decreases the electron density over the benzene ring.

A
Assertion and reason both are correct and reason is correct explanation of assertion.
B
Assertion and reason both are wrong statements.
C
Assertion is correct but reason is wrong statement.
D
Assertion is wrong but reason is correct statement.
E
Assertion and reason both are correct statements but reason is not correct explanation of assertion.
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