Haloalkanes and Haloarenes Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following has the highest density?

Density increases with molecular weight for similar structures. \( \ce{CH3I} \) (iodomethane) has the highest density among \( \ce{CH3X} \) compounds.

\( \ce{CH3F} \)
\( \ce{CH3Cl} \)
\( \ce{CH3Br} \)
\( \ce{CH3I} \)
4

What is the product when \( \ce{CH3CH2CH2Cl} \) reacts with \( \ce{NaOCH2CH3} \) in ethanol?

\( \ce{NaOCH2CH3} \) substitutes Cl in \( \ce{CH3CH2CH2Cl} \) via \( \ce{S_N2} \), forming \( \ce{CH3CH2CH2OCH2CH3} \) (ethyl propyl ether).

\( \ce{CH3CH2CH3} \)
\( \ce{CH3CH=CH2} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{CH3CH2CH2OCH2CH3} \)
4

Which reagent converts 1-propanol to 1-bromopropane with \( \ce{H2SO4} \)?

\( \ce{NaBr} \) with \( \ce{H2SO4} \) reacts with 1-propanol (\( \ce{CH3CH2CH2OH} \)) to form 1-bromopropane (\( \ce{CH3CH2CH2Br} \)).

\( \ce{NaBr} \)
\( \ce{PBr3} \)
\( \ce{SOCl2} \)
\( \ce{HCl} \)
1

Which halide has the highest density among the following at room temperature?

Density increases with molecular weight for similar structures. \( \ce{CH3CH2CH2I} \) (1-iodopropane) has the highest molecular weight.

\( \ce{CH3CH2CH2F} \)
\( \ce{CH3CH2CH2Cl} \)
\( \ce{CH3CH2CH2Br} \)
\( \ce{CH3CH2CH2I} \)
4

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

\( \ce{KCN} \) provides \( \ce{CN^-} \), which undergoes nucleophilic substitution with \( \ce{CH3CH2Br} \) to form \( \ce{CH3CH2CN} \) (propanenitrile).

\( \ce{CH3CH3} \)
\( \ce{CH3CH2OH} \)
\( \ce{CH3CH2NC} \)
\( \ce{CH3CH2CN} \)
4

Which condition enhances the yield of \( \ce{C6H4Cl2} \) from \( \ce{C6H6} \) with \( \ce{Cl2} \)?

Electrophilic substitution of benzene with \( \ce{Cl2} \) and \( \ce{FeCl3} \) in the dark forms \( \ce{C6H4Cl2} \) (1,4-dichlorobenzene) efficiently.

UV light
High temperature
\( \ce{FeCl3} \) in dark
Aqueous medium
3

What is the product of \( \ce{CH3CH2Cl} \) with \( \ce{AgCN} \)?

\( \ce{AgCN} \) provides \( \ce{NC^-} \) (isocyanide ion), reacting with \( \ce{CH3CH2Cl} \) to form \( \ce{CH3CH2NC} \) (ethyl isocyanide) via nucleophilic substitution.

\( \ce{CH3CH2CN} \)
\( \ce{CH3CH2NC} \)
\( \ce{CH3CN} \)
\( \ce{CH3CH3} \)
2

Which of the following is most reactive towards \( \ce{S_N2} \) substitution with \( \ce{CN^-} \)?

\( \ce{S_N2} \) favors primary halides due to less steric hindrance. \( \ce{CH3CH2CH2CH2I} \) (iodide) is most reactive due to the best leaving group.

\( \ce{CH3CH2CH2CH2I} \)
\( \ce{CH3CHClCH2CH3} \)
\( \ce{(CH3)3CBr} \)
\( \ce{C6H5Cl} \)
1

What is the IUPAC name of \( \ce{CH3CH(CH3)CH2Cl} \)?

The longest chain is four carbons (butane), with a methyl group on the second carbon and chlorine on the fourth. The name is 1-chloro-2-methylbutane.

1-Chloro-2-methylbutane
2-Chloro-3-methylbutane
1-Chloro-3-methylbutane
4-Chloro-2-methylbutane
1

Which of the following undergoes nucleophilic substitution most readily via \( \ce{S_N1} \) mechanism?

\( \ce{S_N1} \) reactivity increases with carbocation stability. \( \ce{(CH3)3CCl} \) (tertiary) forms a stable tertiary carbocation, making it most reactive.

\( \ce{(CH3)3CCl} \)
\( \ce{CH3CH2Cl} \)
\( \ce{CH3CHClCH3} \)
\( \ce{CH3Cl} \)
1

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