Haloalkanes and Haloarenes Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which halide reacts with \( \ce{Mg} \) in dry ether to form a reagent that produces \( \ce{CH3CH2CH3} \) on hydrolysis?

\( \ce{CH3CH2CH2Br} \) forms \( \ce{CH3CH2CH2MgBr} \) with \( \ce{Mg} \), which hydrolyzes with \( \ce{H2O} \) to \( \ce{CH3CH2CH3} \) (propane).

\( \ce{CH3Cl} \)
\( \ce{CH3CH2Cl} \)
\( \ce{CH3CHClCH3} \)
\( \ce{CH3CH2CH2Br} \)
4

What is the product when benzene reacts with \( \ce{CH3Cl} \) and \( \ce{AlCl3} \)?

Friedel-Crafts alkylation of benzene with \( \ce{CH3Cl} \) and \( \ce{AlCl3} \) forms \( \ce{C6H5CH3} \) (toluene).

\( \ce{C6H5Cl} \)
\( \ce{C6H5CH3} \)
\( \ce{C6H6} \)
\( \ce{C6H5CH2Cl} \)
2

What is the product when \( \ce{CH3CH2CH2Cl} \) reacts with \( \ce{NaNH2} \) in liquid ammonia?

\( \ce{NaNH2} \) in liquid ammonia (strong base) promotes elimination (E2) in \( \ce{CH3CH2CH2Cl} \), forming \( \ce{CH3CH=CH2} \) (propene).

\( \ce{CH3CH2CH2NH2} \)
\( \ce{CH3CH2CH3} \)
\( \ce{CH3CH2CH2OH} \)
\( \ce{CH3CH=CH2} \)
4

Which of the following undergoes electrophilic substitution to form \( \ce{C6H5I} \)?

Benzene (\( \ce{C6H6} \)) reacts with \( \ce{I2} \) in the presence of an oxidizing agent (e.g., \( \ce{HNO3} \)) to form iodobenzene (\( \ce{C6H5I} \)).

\( \ce{C6H6} \)
\( \ce{CH3CH2I} \)
\( \ce{CH3CH=CH2} \)
\( \ce{CH3CH2CH2I} \)
1

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

Bond length decreases with smaller halogen size. \( \ce{CH3F} \) has the shortest C-X bond due to fluorine’s small atomic radius.

\( \ce{CH3I} \)
\( \ce{CH3F} \)
\( \ce{CH3Br} \)
\( \ce{CH3Cl} \)
2

Which reagent converts 2-propanol to 2-bromopropane?

\( \ce{HBr} \) reacts with 2-propanol (\( \ce{CH3CHOHCH3} \)) to form 2-bromopropane (\( \ce{CH3CHBrCH3} \)) via nucleophilic substitution.

\( \ce{HBr} \)
\( \ce{HCl} \)
\( \ce{SOCl2} \)
\( \ce{PCl5} \)
1

Which of the following is most reactive towards \( \ce{S_N1} \) substitution?

\( \ce{S_N1} \) reactivity increases with carbocation stability. \( \ce{(CH3)2CHCH2C(CH3)2Cl} \) forms a tertiary carbocation, making it most reactive.

\( \ce{(CH3)2CHCH2C(CH3)2Cl} \)
\( \ce{CH3CH2CH2Cl} \)
\( \ce{CH3CHClCH2CH3} \)
\( \ce{CH3CH2CH2CH2Cl} \)
1

A primary alcohol reacts with a phosphorus halide to form \( \ce{CH3CH2CH2CH2Cl} \). Which reagent is used?

\( \ce{PCl5} \) reacts with 1-butanol (\( \ce{CH3CH2CH2CH2OH} \)) to form 1-chlorobutane (\( \ce{CH3CH2CH2CH2Cl} \)) with \( \ce{POCl3} \) and \( \ce{HCl} \) as byproducts.

\( \ce{PCl5} \)
\( \ce{PBr3} \)
\( \ce{PI3} \)
\( \ce{SOCl2} \)
1

What is the product when \( \ce{CH3CH2CH2CH2Cl} \) reacts with \( \ce{Na} \) in dry ether?

This is a Wurtz reaction, coupling two \( \ce{CH3CH2CH2CH2Cl} \) molecules to form \( \ce{CH3CH2CH2CH2CH2CH2CH2CH3} \) (octane).

\( \ce{CH3CH2CH2CH3} \)
\( \ce{CH3CH2CH=CH2} \)
\( \ce{CH3CH2CH2CH2OH} \)
\( \ce{CH3CH2CH2CH2CH2CH2CH2CH3} \)
4

What is the product when \( \ce{CH3CH2Br} \) reacts with \( \ce{Mg} \) in dry ether?

\( \ce{CH3CH2Br} \) reacts with \( \ce{Mg} \) to form the Grignard reagent \( \ce{CH3CH2MgBr} \) (ethylmagnesium bromide).

\( \ce{CH3CH3} \)
\( \ce{CH3CH2OH} \)
\( \ce{CH2=CH2} \)
\( \ce{CH3CH2MgBr} \)
4

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