Elimination Reactions of Haloalkanes
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CHXII10:HALOALKANES AND HALOARENES

322416 How many isomer of \({\mathrm{\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}}}\) when reacts with \({\mathrm{\mathrm{NaNH}_{2}}}\) diastereomers will form? (excluding stereoisomer)

1 1
2 2
3 3
4 4
CHXII10:HALOALKANES AND HALOARENES

322417 Consider the following alkyl halides
\(\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{I,}}}\limits_{\rm{I}} \,\,\,\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{Cl}}}\limits_{{\rm{II}}} {\rm{,}}\,\,\,\,\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{Br}}}\limits_{{\rm{III}}} {\rm{,}}\,\,\,\mathop {\,{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{\;F}}}\limits_{{\rm{IV}}} \)
(I) I, undergoes faster dehydrohalogenation than (II) and (IV).
(II) II, undergoes lower dehydrohalogenation than (I).
(III) IV, has least ability to undergo dehydrohalogenation.
Choose the correct option.

1 Only I
2 I, II and III
3 Both II and III
4 Only III
CHXII10:HALOALKANES AND HALOARENES

322418 When Ethyl chloride is reacted with alcoholic \(\mathrm{KOH}\), ethylene is formed. This is an example of

1 Addition reaction
2 Substitution reaction
3 Elimination reaction
4 Rearrangement reaction
CHXII10:HALOALKANES AND HALOARENES

322419 Reactivity order of halides for dehydrohalogenation is

1 \(\mathrm{R}-\mathrm{F}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\) I
2 \(\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{F}\)
3 \(\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{F}\)
4 \(\mathrm{R}-\mathrm{F}>\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}\)
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CHXII10:HALOALKANES AND HALOARENES

322416 How many isomer of \({\mathrm{\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}}}\) when reacts with \({\mathrm{\mathrm{NaNH}_{2}}}\) diastereomers will form? (excluding stereoisomer)

1 1
2 2
3 3
4 4
CHXII10:HALOALKANES AND HALOARENES

322417 Consider the following alkyl halides
\(\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{I,}}}\limits_{\rm{I}} \,\,\,\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{Cl}}}\limits_{{\rm{II}}} {\rm{,}}\,\,\,\,\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{Br}}}\limits_{{\rm{III}}} {\rm{,}}\,\,\,\mathop {\,{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{\;F}}}\limits_{{\rm{IV}}} \)
(I) I, undergoes faster dehydrohalogenation than (II) and (IV).
(II) II, undergoes lower dehydrohalogenation than (I).
(III) IV, has least ability to undergo dehydrohalogenation.
Choose the correct option.

1 Only I
2 I, II and III
3 Both II and III
4 Only III
CHXII10:HALOALKANES AND HALOARENES

322418 When Ethyl chloride is reacted with alcoholic \(\mathrm{KOH}\), ethylene is formed. This is an example of

1 Addition reaction
2 Substitution reaction
3 Elimination reaction
4 Rearrangement reaction
CHXII10:HALOALKANES AND HALOARENES

322419 Reactivity order of halides for dehydrohalogenation is

1 \(\mathrm{R}-\mathrm{F}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\) I
2 \(\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{F}\)
3 \(\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{F}\)
4 \(\mathrm{R}-\mathrm{F}>\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}\)
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CHXII10:HALOALKANES AND HALOARENES

322416 How many isomer of \({\mathrm{\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}}}\) when reacts with \({\mathrm{\mathrm{NaNH}_{2}}}\) diastereomers will form? (excluding stereoisomer)

1 1
2 2
3 3
4 4
CHXII10:HALOALKANES AND HALOARENES

322417 Consider the following alkyl halides
\(\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{I,}}}\limits_{\rm{I}} \,\,\,\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{Cl}}}\limits_{{\rm{II}}} {\rm{,}}\,\,\,\,\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{Br}}}\limits_{{\rm{III}}} {\rm{,}}\,\,\,\mathop {\,{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{\;F}}}\limits_{{\rm{IV}}} \)
(I) I, undergoes faster dehydrohalogenation than (II) and (IV).
(II) II, undergoes lower dehydrohalogenation than (I).
(III) IV, has least ability to undergo dehydrohalogenation.
Choose the correct option.

1 Only I
2 I, II and III
3 Both II and III
4 Only III
CHXII10:HALOALKANES AND HALOARENES

322418 When Ethyl chloride is reacted with alcoholic \(\mathrm{KOH}\), ethylene is formed. This is an example of

1 Addition reaction
2 Substitution reaction
3 Elimination reaction
4 Rearrangement reaction
CHXII10:HALOALKANES AND HALOARENES

322419 Reactivity order of halides for dehydrohalogenation is

1 \(\mathrm{R}-\mathrm{F}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\) I
2 \(\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{F}\)
3 \(\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{F}\)
4 \(\mathrm{R}-\mathrm{F}>\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}\)
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CHXII10:HALOALKANES AND HALOARENES

322416 How many isomer of \({\mathrm{\mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}}}\) when reacts with \({\mathrm{\mathrm{NaNH}_{2}}}\) diastereomers will form? (excluding stereoisomer)

1 1
2 2
3 3
4 4
CHXII10:HALOALKANES AND HALOARENES

322417 Consider the following alkyl halides
\(\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{I,}}}\limits_{\rm{I}} \,\,\,\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{Cl}}}\limits_{{\rm{II}}} {\rm{,}}\,\,\,\,\mathop {{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{Br}}}\limits_{{\rm{III}}} {\rm{,}}\,\,\,\mathop {\,{{\rm{C}}_{\rm{2}}}{{\rm{H}}_{\rm{5}}}{\rm{\;F}}}\limits_{{\rm{IV}}} \)
(I) I, undergoes faster dehydrohalogenation than (II) and (IV).
(II) II, undergoes lower dehydrohalogenation than (I).
(III) IV, has least ability to undergo dehydrohalogenation.
Choose the correct option.

1 Only I
2 I, II and III
3 Both II and III
4 Only III
CHXII10:HALOALKANES AND HALOARENES

322418 When Ethyl chloride is reacted with alcoholic \(\mathrm{KOH}\), ethylene is formed. This is an example of

1 Addition reaction
2 Substitution reaction
3 Elimination reaction
4 Rearrangement reaction
CHXII10:HALOALKANES AND HALOARENES

322419 Reactivity order of halides for dehydrohalogenation is

1 \(\mathrm{R}-\mathrm{F}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\) I
2 \(\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{F}\)
3 \(\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{F}\)
4 \(\mathrm{R}-\mathrm{F}>\mathrm{R}-\) I \(>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}\)
KCET - 2016
NEET DIGITAL LIBRARY