Reaction takes place as under: \({\mathrm{\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{CH}+\mathrm{Na} \rightarrow \mathrm{CH}_{3}-\mathrm{C} \equiv \overline{\mathrm{C}} \stackrel{+}{\mathrm{Na}}+\mathrm{H}_{2} \uparrow}}\) \({\rm{C}}{{\rm{H}}_{\rm{3}}} - {\rm{C}} \equiv \overline {\rm{C}} \mathop {{\rm{Na}}}\limits^{\rm{ + }} {\rm{ + }}\mathop {{\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CHC}}{{\rm{H}}_{\rm{2}}}}\limits_{{\rm{(B)}}} - {\rm{Br}} \to \) \(\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{C}}{{\rm{H}}_3} - {\rm{C}} \equiv {{\rm{C}}_{({\rm{C}})}} - {\rm{C}}{{\rm{H}}_2}{\rm{C}}{{\rm{H}}_2}{\rm{C}}{{\rm{H}}_3} + {\rm{NaBr}}\) So, the correct option is (2).
JEE Main - 2024
CHXI13:HYDROCARBONS
318145
Assertion : Acetylene reacts with sodamide to evolve \(\mathrm{NH}_{3}\) gas. Reason : Acetylene is a weaker acid than ammonia.
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:
\({\text{HC}} \equiv {\text{CH}} + {\text{NaNH}}_2^ - \to {\text{HC}} \equiv \overline {\text{C}} {\text{N}}{{\text{a}}^ + } + {\text{N}}{{\text{H}}_3}\) Acetylene is a stronger acid than ammonia. So, option (3) is correct
CHXI13:HYDROCARBONS
318146
Which of the following compounds reacts with an aqueous solution of \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) ?
1 Ethane
2 Ethene
3 1-butyne
4 2-butyne
Explanation:
Due to the acidic nature of the hydrogen atoms attached to a triple bonded carbon atoms, acetylene and terminal alkynes form metal acetylides. Reaction with ammonical \(\mathrm{AgNO}_{3}\) solution \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) is as follows:
CHXI13:HYDROCARBONS
318147
Acetylenic hydrocarbons are acidic because
1 Sigma electron density of \({\text{C - H}}\) bond in acetylene is nearer a carbon which has \(50 \%\) s-character
2 Acetylene has only one hydrogen atom at each carbon atom
3 Acetylene contains least number of hydrogen atoms among the possible
4 Acetylene belongs to the class of alkynes with formula \(\mathrm{C}_{n} \mathrm{H}_{2 n-2}\)
Explanation:
The acidic character of \(\mathrm{H}\) is, \({\text{F - H > O - H > }} \equiv {\text{ C - H > N - H ; H}}\) atom attached on F, O, N and triply bonded carbon is acidic.
Reaction takes place as under: \({\mathrm{\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{CH}+\mathrm{Na} \rightarrow \mathrm{CH}_{3}-\mathrm{C} \equiv \overline{\mathrm{C}} \stackrel{+}{\mathrm{Na}}+\mathrm{H}_{2} \uparrow}}\) \({\rm{C}}{{\rm{H}}_{\rm{3}}} - {\rm{C}} \equiv \overline {\rm{C}} \mathop {{\rm{Na}}}\limits^{\rm{ + }} {\rm{ + }}\mathop {{\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CHC}}{{\rm{H}}_{\rm{2}}}}\limits_{{\rm{(B)}}} - {\rm{Br}} \to \) \(\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{C}}{{\rm{H}}_3} - {\rm{C}} \equiv {{\rm{C}}_{({\rm{C}})}} - {\rm{C}}{{\rm{H}}_2}{\rm{C}}{{\rm{H}}_2}{\rm{C}}{{\rm{H}}_3} + {\rm{NaBr}}\) So, the correct option is (2).
JEE Main - 2024
CHXI13:HYDROCARBONS
318145
Assertion : Acetylene reacts with sodamide to evolve \(\mathrm{NH}_{3}\) gas. Reason : Acetylene is a weaker acid than ammonia.
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:
\({\text{HC}} \equiv {\text{CH}} + {\text{NaNH}}_2^ - \to {\text{HC}} \equiv \overline {\text{C}} {\text{N}}{{\text{a}}^ + } + {\text{N}}{{\text{H}}_3}\) Acetylene is a stronger acid than ammonia. So, option (3) is correct
CHXI13:HYDROCARBONS
318146
Which of the following compounds reacts with an aqueous solution of \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) ?
1 Ethane
2 Ethene
3 1-butyne
4 2-butyne
Explanation:
Due to the acidic nature of the hydrogen atoms attached to a triple bonded carbon atoms, acetylene and terminal alkynes form metal acetylides. Reaction with ammonical \(\mathrm{AgNO}_{3}\) solution \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) is as follows:
CHXI13:HYDROCARBONS
318147
Acetylenic hydrocarbons are acidic because
1 Sigma electron density of \({\text{C - H}}\) bond in acetylene is nearer a carbon which has \(50 \%\) s-character
2 Acetylene has only one hydrogen atom at each carbon atom
3 Acetylene contains least number of hydrogen atoms among the possible
4 Acetylene belongs to the class of alkynes with formula \(\mathrm{C}_{n} \mathrm{H}_{2 n-2}\)
Explanation:
The acidic character of \(\mathrm{H}\) is, \({\text{F - H > O - H > }} \equiv {\text{ C - H > N - H ; H}}\) atom attached on F, O, N and triply bonded carbon is acidic.
Reaction takes place as under: \({\mathrm{\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{CH}+\mathrm{Na} \rightarrow \mathrm{CH}_{3}-\mathrm{C} \equiv \overline{\mathrm{C}} \stackrel{+}{\mathrm{Na}}+\mathrm{H}_{2} \uparrow}}\) \({\rm{C}}{{\rm{H}}_{\rm{3}}} - {\rm{C}} \equiv \overline {\rm{C}} \mathop {{\rm{Na}}}\limits^{\rm{ + }} {\rm{ + }}\mathop {{\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CHC}}{{\rm{H}}_{\rm{2}}}}\limits_{{\rm{(B)}}} - {\rm{Br}} \to \) \(\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{C}}{{\rm{H}}_3} - {\rm{C}} \equiv {{\rm{C}}_{({\rm{C}})}} - {\rm{C}}{{\rm{H}}_2}{\rm{C}}{{\rm{H}}_2}{\rm{C}}{{\rm{H}}_3} + {\rm{NaBr}}\) So, the correct option is (2).
JEE Main - 2024
CHXI13:HYDROCARBONS
318145
Assertion : Acetylene reacts with sodamide to evolve \(\mathrm{NH}_{3}\) gas. Reason : Acetylene is a weaker acid than ammonia.
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:
\({\text{HC}} \equiv {\text{CH}} + {\text{NaNH}}_2^ - \to {\text{HC}} \equiv \overline {\text{C}} {\text{N}}{{\text{a}}^ + } + {\text{N}}{{\text{H}}_3}\) Acetylene is a stronger acid than ammonia. So, option (3) is correct
CHXI13:HYDROCARBONS
318146
Which of the following compounds reacts with an aqueous solution of \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) ?
1 Ethane
2 Ethene
3 1-butyne
4 2-butyne
Explanation:
Due to the acidic nature of the hydrogen atoms attached to a triple bonded carbon atoms, acetylene and terminal alkynes form metal acetylides. Reaction with ammonical \(\mathrm{AgNO}_{3}\) solution \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) is as follows:
CHXI13:HYDROCARBONS
318147
Acetylenic hydrocarbons are acidic because
1 Sigma electron density of \({\text{C - H}}\) bond in acetylene is nearer a carbon which has \(50 \%\) s-character
2 Acetylene has only one hydrogen atom at each carbon atom
3 Acetylene contains least number of hydrogen atoms among the possible
4 Acetylene belongs to the class of alkynes with formula \(\mathrm{C}_{n} \mathrm{H}_{2 n-2}\)
Explanation:
The acidic character of \(\mathrm{H}\) is, \({\text{F - H > O - H > }} \equiv {\text{ C - H > N - H ; H}}\) atom attached on F, O, N and triply bonded carbon is acidic.
Reaction takes place as under: \({\mathrm{\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{CH}+\mathrm{Na} \rightarrow \mathrm{CH}_{3}-\mathrm{C} \equiv \overline{\mathrm{C}} \stackrel{+}{\mathrm{Na}}+\mathrm{H}_{2} \uparrow}}\) \({\rm{C}}{{\rm{H}}_{\rm{3}}} - {\rm{C}} \equiv \overline {\rm{C}} \mathop {{\rm{Na}}}\limits^{\rm{ + }} {\rm{ + }}\mathop {{\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CHC}}{{\rm{H}}_{\rm{2}}}}\limits_{{\rm{(B)}}} - {\rm{Br}} \to \) \(\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{C}}{{\rm{H}}_3} - {\rm{C}} \equiv {{\rm{C}}_{({\rm{C}})}} - {\rm{C}}{{\rm{H}}_2}{\rm{C}}{{\rm{H}}_2}{\rm{C}}{{\rm{H}}_3} + {\rm{NaBr}}\) So, the correct option is (2).
JEE Main - 2024
CHXI13:HYDROCARBONS
318145
Assertion : Acetylene reacts with sodamide to evolve \(\mathrm{NH}_{3}\) gas. Reason : Acetylene is a weaker acid than ammonia.
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:
\({\text{HC}} \equiv {\text{CH}} + {\text{NaNH}}_2^ - \to {\text{HC}} \equiv \overline {\text{C}} {\text{N}}{{\text{a}}^ + } + {\text{N}}{{\text{H}}_3}\) Acetylene is a stronger acid than ammonia. So, option (3) is correct
CHXI13:HYDROCARBONS
318146
Which of the following compounds reacts with an aqueous solution of \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) ?
1 Ethane
2 Ethene
3 1-butyne
4 2-butyne
Explanation:
Due to the acidic nature of the hydrogen atoms attached to a triple bonded carbon atoms, acetylene and terminal alkynes form metal acetylides. Reaction with ammonical \(\mathrm{AgNO}_{3}\) solution \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) is as follows:
CHXI13:HYDROCARBONS
318147
Acetylenic hydrocarbons are acidic because
1 Sigma electron density of \({\text{C - H}}\) bond in acetylene is nearer a carbon which has \(50 \%\) s-character
2 Acetylene has only one hydrogen atom at each carbon atom
3 Acetylene contains least number of hydrogen atoms among the possible
4 Acetylene belongs to the class of alkynes with formula \(\mathrm{C}_{n} \mathrm{H}_{2 n-2}\)
Explanation:
The acidic character of \(\mathrm{H}\) is, \({\text{F - H > O - H > }} \equiv {\text{ C - H > N - H ; H}}\) atom attached on F, O, N and triply bonded carbon is acidic.
