Haloalkanes and Haloarenes Chapter-Wise Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the product when \( \ce{CH3CH2CH2CHBrCH3} \) reacts with alcoholic \( \ce{KOH} \)?

Alcoholic \( \ce{KOH} \) promotes elimination (E2) in \( \ce{CH3CH2CH2CHBrCH3} \), forming \( \ce{CH3CH2CH=CHCH3} \) (2-pentene) per Zaitsev’s rule.

\( \ce{CH3CH2CH2CH2CH3} \)
\( \ce{CH3CH2CH2CH2OH} \)
\( \ce{CH3CH2CH2CH=CH2} \)
\( \ce{CH3CH2CH=CHCH3} \)
4

What is the order of reactivity of halogens in free radical halogenation of alkanes?

Reactivity in free radical halogenation decreases with bond strength: \( \ce{F2} \) > \( \ce{Cl2} \) > \( \ce{Br2} \) > \( \ce{I2} \).

\( \ce{I2} \) > \( \ce{Br2} \) > \( \ce{Cl2} \) > \( \ce{F2} \)
\( \ce{Br2} \) > \( \ce{Cl2} \) > \( \ce{F2} \) > \( \ce{I2} \)
\( \ce{F2} \) > \( \ce{Cl2} \) > \( \ce{Br2} \) > \( \ce{I2} \)
\( \ce{Cl2} \) > \( \ce{F2} \) > \( \ce{I2} \) > \( \ce{Br2} \)
3

Which alkane produces \( \ce{CH3CH2CHClCH2CH3} \) as the major product on chlorination in sunlight?

Pentane (\( \ce{CH3CH2CH2CH2CH3} \)) on chlorination favors the secondary position (C3), forming \( \ce{CH3CH2CHClCH2CH3} \) (3-chloropentane).

\( \ce{CH3CH2CH2CH2CH3} \)
\( \ce{CH3CH2CH2CH3} \)
\( \ce{CH3CH(CH3)CH2CH3} \)
\( \ce{CH3CH2CH2CH2CH2CH3} \)
1

Which nucleophile replaces Br in \( \ce{CH3CH2CH2CH2Br} \) to form \( \ce{CH3CH2CH2CH2ONO2} \)?

\( \ce{AgNO3} \) provides \( \ce{NO3^-} \), which substitutes Br in \( \ce{CH3CH2CH2CH2Br} \) to form the nitrate ester \( \ce{CH3CH2CH2CH2ONO2} \).

\( \ce{NaCN} \)
\( \ce{AgNO3} \)
\( \ce{KOH} \)
\( \ce{NaSH} \)
2

Which of the following has the lowest boiling point?

Boiling point decreases with lower molecular weight. \( \ce{CH3CH2F} \) has the lowest molecular weight among the options.

\( \ce{CH3CH2I} \)
\( \ce{CH3CH2F} \)
\( \ce{CH3CH2Br} \)
\( \ce{CH3CH2Cl} \)
2

What is the precipitate formed when \( \ce{CH3CH2CH2Br} \) reacts with \( \ce{AgNO3} \) in ethanol?

\( \ce{CH3CH2CH2Br} \) reacts via \( \ce{S_N1} \) with \( \ce{AgNO3} \), forming \( \ce{AgBr} \) (yellow precipitate) and \( \ce{CH3CH2CH2ONO2} \).

\( \ce{AgCl} \)
\( \ce{AgBr} \)
\( \ce{AgI} \)
\( \ce{AgF} \)
2

What is the product when \( \ce{CH3CH2Br} \) reacts with \( \ce{NaSH} \) in ethanol?

\( \ce{NaSH} \) provides \( \ce{SH^-} \), which substitutes Br in \( \ce{CH3CH2Br} \) via \( \ce{S_N2} \), forming \( \ce{CH3CH2SH} \) (ethanethiol).

\( \ce{CH3CH2OH} \)
\( \ce{CH3CH2SH} \)
\( \ce{CH3CH3} \)
\( \ce{CH3SH} \)
2

What is the leaving group in the reaction of \( \ce{CH3CH2CH2Br} \) with \( \ce{KCN} \) to form \( \ce{CH3CH2CH2CN} \)?

In the \( \ce{S_N2} \) reaction, \( \ce{Br^-} \) is displaced by \( \ce{CN^-} \) and acts as the leaving group.

\( \ce{CN^-} \)
\( \ce{K^+} \)
\( \ce{CH3CH2CH2^+} \)
\( \ce{Br^-} \)
4

Which of the following is a primary alkyl halide?

A primary alkyl halide has the halogen attached to a carbon bonded to only one other carbon. \( \ce{CH3CH2CH2Br} \) (1-bromopropane) fits this definition.

\( \ce{CH3CH2CH2Br} \)
\( \ce{(CH3)2CHBr} \)
\( \ce{(CH3)3CBr} \)
\( \ce{CH3CH(Br)CH3} \)
1

What is the product when \( \ce{CH3CHClCH3} \) reacts with \( \ce{Mg} \) in dry ether, followed by \( \ce{H2O} \)?

\( \ce{CH3CHClCH3} \) forms a Grignard reagent (\( \ce{CH3CH(MgCl)CH3} \)) with \( \ce{Mg} \), which hydrolyzes with \( \ce{H2O} \) to \( \ce{CH3CH2CH3} \) (propane).

\( \ce{CH3CH=CH2} \)
\( \ce{CH3CH2OH} \)
\( \ce{CH3CHOHCH3} \)
\( \ce{CH3CH2CH3} \)
4

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