NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXI13:HYDROCARBONS
317968
Which of the following reactants is suitable for preparation of methane and ethane by using one step only?
1 \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}\)
2 \(\mathrm{CH}_{3} \mathrm{OH}\)
3 \(\mathrm{CH}_{3}-\mathrm{Br}\)
4 \(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{OH}\)
Explanation:
Conceptual Questions
CHXI13:HYDROCARBONS
317969
Which of the following alkane cannot be made in good yield by Wurtz reaction?
1 2, 3-Dimethylbutane
2 n-Heptane
3 n-Butane
4 n-Hexane
Explanation:
n-Heptane can not be made in good yield using Wurtz reaction since it is unsymmetrical alkane.
NEET - 2020
CHXI13:HYDROCARBONS
317970
Assertion : Cycloalkanes are formed when \(\alpha, \omega\)-dihalides are treated with sodium or zinc. Reason : This reaction is intermolecular Wurtz reaction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
\(\alpha, \omega\)-Dihalides when treated with \(\mathrm{Na} / \mathrm{Zn}\) form cycloalkanes. This reaction can be regarded as intramolecular Wurtz reaction as cyclization happens within the same molecule. So, option (3) is correct.
CHXI13:HYDROCARBONS
317971
The compound which is not formed when a mixture of \({\text{n}}\)-butyl bromide and ethyl bromide treated with sodium metal in the presence of dry ether is
1 butane
2 octane
3 hexane
4 ethane
Explanation:
When a mixture of n-butyl bromide and ethyl bromide is treated with sodium metal in the presence of dry ether, then ethane cannot be formed because reaction follows Wurtz-Fittig reaction. It is a type of coupling reaciton. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Br}+2 \mathrm{Na} \underset{\text { Ether }}{\stackrel{\text { Dry }}{\longrightarrow}}\) \(\mathop {{{\text{C}}_4}{{\text{H}}_9} - {{\text{C}}_4}{{\text{H}}_9}}\limits_{{\text{Octane}}} + \mathop {{{\text{C}}_4}{{\text{H}}_9} - {{\text{C}}_2}{{\text{H}}_5}}\limits_{{\text{ Hexane }}} + \mathop {{{\text{C}}_2}{{\text{H}}_5} - {{\text{C}}_2}{{\text{H}}_5}}\limits_{{\text{ Butane }}} \)
317968
Which of the following reactants is suitable for preparation of methane and ethane by using one step only?
1 \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}\)
2 \(\mathrm{CH}_{3} \mathrm{OH}\)
3 \(\mathrm{CH}_{3}-\mathrm{Br}\)
4 \(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{OH}\)
Explanation:
Conceptual Questions
CHXI13:HYDROCARBONS
317969
Which of the following alkane cannot be made in good yield by Wurtz reaction?
1 2, 3-Dimethylbutane
2 n-Heptane
3 n-Butane
4 n-Hexane
Explanation:
n-Heptane can not be made in good yield using Wurtz reaction since it is unsymmetrical alkane.
NEET - 2020
CHXI13:HYDROCARBONS
317970
Assertion : Cycloalkanes are formed when \(\alpha, \omega\)-dihalides are treated with sodium or zinc. Reason : This reaction is intermolecular Wurtz reaction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
\(\alpha, \omega\)-Dihalides when treated with \(\mathrm{Na} / \mathrm{Zn}\) form cycloalkanes. This reaction can be regarded as intramolecular Wurtz reaction as cyclization happens within the same molecule. So, option (3) is correct.
CHXI13:HYDROCARBONS
317971
The compound which is not formed when a mixture of \({\text{n}}\)-butyl bromide and ethyl bromide treated with sodium metal in the presence of dry ether is
1 butane
2 octane
3 hexane
4 ethane
Explanation:
When a mixture of n-butyl bromide and ethyl bromide is treated with sodium metal in the presence of dry ether, then ethane cannot be formed because reaction follows Wurtz-Fittig reaction. It is a type of coupling reaciton. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Br}+2 \mathrm{Na} \underset{\text { Ether }}{\stackrel{\text { Dry }}{\longrightarrow}}\) \(\mathop {{{\text{C}}_4}{{\text{H}}_9} - {{\text{C}}_4}{{\text{H}}_9}}\limits_{{\text{Octane}}} + \mathop {{{\text{C}}_4}{{\text{H}}_9} - {{\text{C}}_2}{{\text{H}}_5}}\limits_{{\text{ Hexane }}} + \mathop {{{\text{C}}_2}{{\text{H}}_5} - {{\text{C}}_2}{{\text{H}}_5}}\limits_{{\text{ Butane }}} \)
317968
Which of the following reactants is suitable for preparation of methane and ethane by using one step only?
1 \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}\)
2 \(\mathrm{CH}_{3} \mathrm{OH}\)
3 \(\mathrm{CH}_{3}-\mathrm{Br}\)
4 \(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{OH}\)
Explanation:
Conceptual Questions
CHXI13:HYDROCARBONS
317969
Which of the following alkane cannot be made in good yield by Wurtz reaction?
1 2, 3-Dimethylbutane
2 n-Heptane
3 n-Butane
4 n-Hexane
Explanation:
n-Heptane can not be made in good yield using Wurtz reaction since it is unsymmetrical alkane.
NEET - 2020
CHXI13:HYDROCARBONS
317970
Assertion : Cycloalkanes are formed when \(\alpha, \omega\)-dihalides are treated with sodium or zinc. Reason : This reaction is intermolecular Wurtz reaction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
\(\alpha, \omega\)-Dihalides when treated with \(\mathrm{Na} / \mathrm{Zn}\) form cycloalkanes. This reaction can be regarded as intramolecular Wurtz reaction as cyclization happens within the same molecule. So, option (3) is correct.
CHXI13:HYDROCARBONS
317971
The compound which is not formed when a mixture of \({\text{n}}\)-butyl bromide and ethyl bromide treated with sodium metal in the presence of dry ether is
1 butane
2 octane
3 hexane
4 ethane
Explanation:
When a mixture of n-butyl bromide and ethyl bromide is treated with sodium metal in the presence of dry ether, then ethane cannot be formed because reaction follows Wurtz-Fittig reaction. It is a type of coupling reaciton. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Br}+2 \mathrm{Na} \underset{\text { Ether }}{\stackrel{\text { Dry }}{\longrightarrow}}\) \(\mathop {{{\text{C}}_4}{{\text{H}}_9} - {{\text{C}}_4}{{\text{H}}_9}}\limits_{{\text{Octane}}} + \mathop {{{\text{C}}_4}{{\text{H}}_9} - {{\text{C}}_2}{{\text{H}}_5}}\limits_{{\text{ Hexane }}} + \mathop {{{\text{C}}_2}{{\text{H}}_5} - {{\text{C}}_2}{{\text{H}}_5}}\limits_{{\text{ Butane }}} \)
317968
Which of the following reactants is suitable for preparation of methane and ethane by using one step only?
1 \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}\)
2 \(\mathrm{CH}_{3} \mathrm{OH}\)
3 \(\mathrm{CH}_{3}-\mathrm{Br}\)
4 \(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{OH}\)
Explanation:
Conceptual Questions
CHXI13:HYDROCARBONS
317969
Which of the following alkane cannot be made in good yield by Wurtz reaction?
1 2, 3-Dimethylbutane
2 n-Heptane
3 n-Butane
4 n-Hexane
Explanation:
n-Heptane can not be made in good yield using Wurtz reaction since it is unsymmetrical alkane.
NEET - 2020
CHXI13:HYDROCARBONS
317970
Assertion : Cycloalkanes are formed when \(\alpha, \omega\)-dihalides are treated with sodium or zinc. Reason : This reaction is intermolecular Wurtz reaction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
\(\alpha, \omega\)-Dihalides when treated with \(\mathrm{Na} / \mathrm{Zn}\) form cycloalkanes. This reaction can be regarded as intramolecular Wurtz reaction as cyclization happens within the same molecule. So, option (3) is correct.
CHXI13:HYDROCARBONS
317971
The compound which is not formed when a mixture of \({\text{n}}\)-butyl bromide and ethyl bromide treated with sodium metal in the presence of dry ether is
1 butane
2 octane
3 hexane
4 ethane
Explanation:
When a mixture of n-butyl bromide and ethyl bromide is treated with sodium metal in the presence of dry ether, then ethane cannot be formed because reaction follows Wurtz-Fittig reaction. It is a type of coupling reaciton. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Br}+2 \mathrm{Na} \underset{\text { Ether }}{\stackrel{\text { Dry }}{\longrightarrow}}\) \(\mathop {{{\text{C}}_4}{{\text{H}}_9} - {{\text{C}}_4}{{\text{H}}_9}}\limits_{{\text{Octane}}} + \mathop {{{\text{C}}_4}{{\text{H}}_9} - {{\text{C}}_2}{{\text{H}}_5}}\limits_{{\text{ Hexane }}} + \mathop {{{\text{C}}_2}{{\text{H}}_5} - {{\text{C}}_2}{{\text{H}}_5}}\limits_{{\text{ Butane }}} \)
