Haloalkanes and Haloarenes Chapter-Wise Test 16

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the major product when \( \ce{CH3CH2CH=CH2} \) reacts with \( \ce{HI} \) in the absence of peroxides?

For 1-butene (\( \ce{CH3CH2CH=CH2} \)), \( \ce{HI} \) adds via Markovnikov’s rule, forming \( \ce{CH3CH2CHICH3} \) (2-iodobutane).

\( \ce{CH3CH2CHICH3} \)
\( \ce{CH3CH2CH2CH2I} \)
\( \ce{CH2ICH2CH2CH3} \)
\( \ce{CH3CHICH2CH3} \)
1

What is the major product when \( \ce{CH3CH=CH2} \) reacts with \( \ce{HBr} \) in the absence of peroxides?

According to Markovnikov’s rule, \( \ce{HBr} \) adds to propene (\( \ce{CH3CH=CH2} \)) such that H attaches to the less substituted carbon, yielding \( \ce{CH3CHBrCH3} \).

\( \ce{CH3CHBrCH3} \)
\( \ce{CH3CH2CH2Br} \)
\( \ce{CH2BrCH2CH3} \)
\( \ce{CH3CH2Br} \)
1

Which of the following is a geminal dihalide?

A geminal dihalide has two halogens on the same carbon. \( \ce{CH3CHCl2} \) (1,1-dichloroethane) is a geminal dihalide.

\( \ce{CH3CH2CHCl2} \)
\( \ce{CH2ClCH2Cl} \)
\( \ce{CH3CHCl2} \)
\( \ce{CH3CHClCH2Cl} \)
3

What is the product when \( \ce{CH3CH2CHOHCH2CH3} \) reacts with \( \ce{SOCl2} \)?

\( \ce{SOCl2} \) converts 3-pentanol (\( \ce{CH3CH2CHOHCH2CH3} \)) to 3-chloropentane (\( \ce{CH3CH2CHClCH2CH3} \)) via substitution.

\( \ce{CH3CH2CH2CH2CH3} \)
\( \ce{CH3CH=CHCH2CH3} \)
\( \ce{CH3CH2CHClCH2CH3} \)
\( \ce{CH3CH2CH2CH2Cl} \)
3

Which halide reacts with \( \ce{Na} \) in ether to form a six-carbon alkane with a branched structure?

Wurtz reaction of \( \ce{(CH3)2CHCH2Cl} \) (1-chloro-2-methylpropane) forms \( \ce{(CH3)2CHCH2CH2CH(CH3)2} \) (2,5-dimethylhexane), a branched six-carbon alkane.

\( \ce{CH3CH2CH2Cl} \)
\( \ce{(CH3)2CHCH2Cl} \)
\( \ce{CH3CH2CH2CH2Cl} \)
\( \ce{CH3CHClCH2CH3} \)
2

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

\( \ce{NaSH} \) substitutes I in \( \ce{CH3CH2I} \) via \( \ce{S_N2} \), forming \( \ce{CH3CH2SH} \) (ethanethiol).

\( \ce{CH3CH2OH} \)
\( \ce{CH3CH2SH} \)
\( \ce{CH3CH3} \)
\( \ce{CH3CH2SCH3} \)
2

What is the product when \( \ce{CH3CH2CHClCH3} \) reacts with \( \ce{Mg} \) in dry ether, followed by \( \ce{H2O} \)?

\( \ce{CH3CH2CHClCH3} \) forms a Grignard reagent with \( \ce{Mg} \), which hydrolyzes with \( \ce{H2O} \) to \( \ce{CH3CH2CH2CH3} \) (butane).

\( \ce{CH3CH2CH=CH2} \)
\( \ce{CH3CH2CHOHCH3} \)
\( \ce{CH3CH=CHCH3} \)
\( \ce{CH3CH2CH2CH3} \)
4

Which compound is formed when aniline is treated with \( \ce{NaNO2} \) and \( \ce{HCl} \), followed by \( \ce{CuCl} \)?

This is the Sandmeyer reaction. Aniline forms a diazonium salt with \( \ce{NaNO2} \) and \( \ce{HCl} \), which reacts with \( \ce{CuCl} \) to yield chlorobenzene (\( \ce{C6H5Cl} \)).

\( \ce{C6H5Br} \)
\( \ce{C6H5I} \)
\( \ce{C6H5Cl} \)
\( \ce{C6H6} \)
3

Which compound has the IUPAC name 2-bromo-3-methylbutane?

2-Bromo-3-methylbutane is a four-carbon chain (butane) with Br on C2 and a methyl group on C3: \( \ce{CH3CHBrCH(CH3)CH3} \).

\( \ce{CH3CHBrCH(CH3)CH3} \)
\( \ce{CH3CH(CH3)CH2Br} \)
\( \ce{CH3CH2CHBrCH3} \)
\( \ce{CH2BrCH2CH(CH3)CH3} \)
1

Which of the following forms a yellow precipitate with \( \ce{AgNO3} \) slowest?

Primary halides react slowest with \( \ce{AgNO3} \) via \( \ce{S_N1} \). \( \ce{CH3CH2CH2I} \) forms \( \ce{AgI} \) (yellow) slowest among the options.

\( \ce{(CH3)3CI} \)
\( \ce{CH3CHICH3} \)
\( \ce{C6H5CH2I} \)
\( \ce{CH3CH2CH2I} \)
4

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