Haloalkanes and Haloarenes Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is a primary halide?

A primary halide has the halogen on a carbon bonded to one other carbon. \( \ce{CH3CH2CH2CH2Br} \) (1-bromobutane) is primary.

\( \ce{CH3CHBrCH3} \)
\( \ce{(CH3)3CBr} \)
\( \ce{CH3CH2CH2CH2Br} \)
\( \ce{CH3CHBrCH2CH3} \)
3

What is the IUPAC name of \( \ce{CH3CH2CH2CH(Cl)CH3} \)?

The compound has a five-carbon chain (pentane) with chlorine on the fourth carbon. The name is 4-chloropentane.

4-Chloropentane
2-Chloropentane
3-Chloropentane
1-Chloropentane
1

Which reagent converts ethanol to ethyl bromide with \( \ce{H2SO4} \)?

Ethanol reacts with \( \ce{NaBr} \) and \( \ce{H2SO4} \) to form ethyl bromide (\( \ce{CH3CH2Br} \)) via nucleophilic substitution, with \( \ce{H2SO4} \) aiding dehydration.

\( \ce{NaBr} \)
\( \ce{PBr3} \)
\( \ce{SOCl2} \)
\(\ce{Br2}\)
1

Which reagent reacts with \( \ce{CH3CH2CH2CH2CH2OH} \) to produce \( \ce{CH3CH2CH2CH2CH2Br} \) and a phosphorus-containing byproduct?

\( \ce{PBr3} \) converts 1-pentanol to 1-bromopentane (\( \ce{CH3CH2CH2CH2CH2Br} \)) with \( \ce{H3PO3} \) as a byproduct.

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

Which nucleophile converts \( \ce{CH3CH2CH2I} \) to \( \ce{CH3CH2CH2OC(CH3)3} \) in a polar aprotic solvent?

\( \ce{NaOC(CH3)3} \) (sodium tert-butoxide) substitutes I in \( \ce{CH3CH2CH2I} \) via \( \ce{S_N2} \) to form \( \ce{CH3CH2CH2OC(CH3)3} \).

\( \ce{NaOH} \)
\( \ce{NaOC(CH3)3} \)
\( \ce{KCN} \)
\( \ce{NaSH} \)
2

Which halide reacts with \( \ce{Na} \) in ether to produce \( \ce{CH3CH2CH2CH2CH3} \) as the major product?

Wurtz reaction couples two \( \ce{CH3CH2CH2Cl} \) (1-chloropropane) molecules with \( \ce{Na} \) to form pentane (\( \ce{CH3CH2CH2CH2CH3} \)).

\( \ce{CH3CH2Cl} \)
\( \ce{CH3CH2CH2Cl} \)
\( \ce{CH3CHClCH3} \)
\( \ce{CH3CH2CH2CH2Br} \)
2

How many monobromo isomers are possible for \( \ce{CH3CH2CH(CH3)CH3} \)?

2-Methylbutane has four unique carbon positions for Br substitution (C1, C2 with methyl, C3, C4), yielding 4 isomers.

2
3
4
5
3

Which halide is formed when benzene undergoes electrophilic substitution with chlorine in the presence of a Lewis acid?

Electrophilic substitution of benzene with chlorine and a Lewis acid (e.g., \( \ce{FeCl3} \)) replaces a hydrogen with chlorine, forming chlorobenzene (\( \ce{C6H5Cl} \)).

\( \ce{C6H5Cl} \)
\( \ce{C6H6Cl2} \)
\( \ce{C6H5Br} \)
\( \ce{C6H4Cl2} \)
1

What is the product when \( \ce{CH3CH2CH2Br} \) reacts with \( \ce{NaCN} \) in DMSO?

\( \ce{NaCN} \) in DMSO (polar aprotic solvent) substitutes Br in \( \ce{CH3CH2CH2Br} \) via \( \ce{S_N2} \), forming \( \ce{CH3CH2CH2CN} \) (butanenitrile).

\( \ce{CH3CH2CH3} \)
\( \ce{CH3CH2CH2CN} \)
\( \ce{CH3CH2CH2NC} \)
\( \ce{CH3CH2OH} \)
2

What is the IUPAC name of the compound \( \ce{CH3CH2CH(Cl)CH3} \)?

The compound has a four-carbon chain with a chlorine atom on the second carbon. The parent chain is butane, and the chlorine is a substituent, so the name is 2-chlorobutane.

2-Chlorobutane
1-Chlorobutane
3-Chlorobutane
2-Chloropropane
1

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