Haloalkanes and Haloarenes Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the product when \( \ce{CH3CH2CH2Cl} \) reacts with \( \ce{KNO2} \) in DMF?

\( \ce{KNO2} \) substitutes Cl via \( \ce{S_N2} \), forming \( \ce{CH3CH2CH2ONO} \) (propyl nitrite), as \( \ce{NO2^-} \) bonds through oxygen.

\( \ce{CH3CH2CH2NO2} \)
\( \ce{CH3CH2CH3} \)
\( \ce{CH3CH=CH2} \)
\( \ce{CH3CH2CH2ONO} \)
4

Which of the following has the highest C-X bond length?

Bond length increases with the size of the halogen. Among F, Cl, Br, and I, iodine is the largest, so \( \ce{CH3-I} \) has the longest C-X bond.

\( \ce{CH3-F} \)
\( \ce{CH3-I} \)
\( \ce{CH3-Cl} \)
\( \ce{CH3-Br} \)
2

What is the product when \( \ce{CH3CH2CH2OH} \) reacts with \( \ce{PCl5} \)?

\( \ce{PCl5} \) converts 1-propanol to 1-chloropropane (\( \ce{CH3CH2CH2Cl} \)) by replacing \( \ce{OH} \) with Cl.

\( \ce{CH3CH2OH} \)
\( \ce{CH3CH2CH3} \)
\( \ce{CH3CH2CH2Cl} \)
\( \ce{CH3CHClCH3} \)
3

Which halide is an allylic halide?

An allylic halide has the halogen on a carbon adjacent to a double bond. \( \ce{CH3CH=CHCH2Cl} \) (4-chloro-2-butene) is allylic.

\( \ce{CH3CH2CH2Cl} \)
\( \ce{CH3CHClCH3} \)
\( \ce{C6H5CH2Cl} \)
\( \ce{CH3CH=CHCH2Cl} \)
4

What is the major alkene formed by dehydrohalogenation of \( \ce{CH3CH(Br)CH3} \) with alcoholic \( \ce{KOH} \)?

Dehydrohalogenation of 2-bromopropane with alcoholic \( \ce{KOH} \) follows Zaitsev’s rule, forming the more substituted alkene, \( \ce{CH3CH=CH2} \) (propene).

\( \ce{CH2=CH2} \)
\( \ce{CH3CH=CH2} \)
\( \ce{CH3CH2CH=CH2} \)
\( \ce{CH2=CHCH2CH3} \)
2

Which halide reacts with \( \ce{AgNO3} \) in ethanol to form a precipitate due to allylic stabilization?

\( \ce{CH2=CHCH2Cl} \) (allyl chloride) forms a stable allylic carbocation via \( \ce{S_N1} \), reacting with \( \ce{AgNO3} \) to form \( \ce{AgCl} \).

\( \ce{CH3CH2Cl} \)
\( \ce{CH3CH=CHCl} \)
\( \ce{CH2=CHCH2Cl} \)
\( \ce{CH3CH2CH2Br} \)
3

What is the product when \( \ce{CH3CH2Cl} \) reacts with \( \ce{Na} \) in the presence of \( \ce{CH3Cl} \)?

This is a Wurtz reaction variant. \( \ce{CH3CH2Cl} \) and \( \ce{CH3Cl} \) couple with \( \ce{Na} \) to form \( \ce{CH3CH2CH3} \) (propane) as one product.

\( \ce{CH3CH=CH2} \)
\( \ce{CH3CH2CH3} \)
\( \ce{CH3CH2OH} \)
\( \ce{CH3CH2CH2CH3} \)
2

What is the product when \( \ce{CH3CH2I} \) reacts with \( \ce{NaOCH3} \) in methanol?

\( \ce{NaOCH3} \) in methanol substitutes I in \( \ce{CH3CH2I} \) via \( \ce{S_N2} \), forming \( \ce{CH3CH2OCH3} \) (ethyl methyl ether).

\( \ce{CH3CH2OH} \)
\( \ce{CH3CH3} \)
\( \ce{CH2=CH2} \)
\( \ce{CH3CH2OCH3} \)
4

Which of the following is a secondary halide?

A secondary halide has the halogen on a carbon bonded to two other carbons. \( \ce{CH3CH2CHBrCH3} \) (3-bromobutane) is secondary.

\( \ce{CH3CH2CH2CH2Cl} \)
\( \ce{(CH3)3CBr} \)
\( \ce{CH3CH2CHBrCH3} \)
\( \ce{CH3CH2CH2I} \)
3

Which halide is a benzylic halide?

A benzylic halide has the halogen on a carbon directly attached to a benzene ring. \( \ce{C6H5CH(CH3)Cl} \) (1-chloroethylbenzene) is benzylic.

\( \ce{CH3CH2Cl} \)
\( \ce{C6H5Cl} \)
\( \ce{CH2=CHCH2Cl} \)
\( \ce{C6H5CH(CH3)Cl} \)
4

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0