317955
For the preparation of alkanes, aqueous solution of sodium or potassium salt of carboxylic acid is subjected to
1 hydrogenation
2 oxidation
3 electrolysis
4 hydrolysis
Explanation:
Electrolysis of aqueous solutions of sodium or potassium salts of fatty acids gives alkane having twice the number of carbon atoms present in the alkyl group of the acid. This process is kown as Kolbe's electrolytic reaction. \(2 \mathrm{RCOONa} \rightarrow 2 \mathrm{RCOO}^{-}+2 \mathrm{Na}^{+}\) At anode: \(2 \mathrm{RCOO}^{-}-2 \mathrm{e}^{-} \rightarrow 2 \mathrm{RCOO}\) \(\underset{\text { Unstable }}{2 \mathrm{RCOO}^{-}} \rightarrow \underset{\text { Alkane }}{\mathrm{R}}-\mathrm{R}+2 \mathrm{CO}_{2}\)
KCET - 2017
CHXI13:HYDROCARBONS
317956
Methane can not be prepared by
1 \(\mathrm{Al}_{4} \mathrm{C}_{3}\)
2 \(\mathrm{Be}_{2} \mathrm{C}\)
3 \(\mathrm{CaC}_{2}\)
4 \(\mathrm{CS}_{2}\)
Explanation:
Methane cannot be prepared by \(\mathrm{CaC}_{2}\). It on hydrolysis produces acetylene. Remaining other carbides produce alkanes. \({\text{A}}{{\text{l}}_{\text{4}}}{{\text{C}}_{\text{3}}}{\text{ + 12}}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{4Al(OH}}{{\text{)}}_{\text{3}}}{\text{ + 3C}}{{\text{H}}_{\text{4}}}\) \({\text{B}}{{\text{e}}_{\text{2}}}{\text{C + 2}}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{2BeO + C}}{{\text{H}}_{\text{4}}}\) \({\text{C}}{{\text{S}}_{\text{2}}}{\text{ + 2}}{{\text{H}}_{\text{2}}}{\text{S}}\xrightarrow[{{\text{ - 4C}}{{\text{u}}_{\text{2}}}{\text{S}}}]{{{\text{ + 8Cu}}}}{\text{C}}{{\text{H}}_{\text{4}}}\) \({\text{Ca}}{{\text{C}}_{\text{2}}}{\text{ + 2}}{{\text{H}}_{\text{2}}}{\text{O}} \to \mathop {\text{C}}\limits^{\text{.}} {\text{a(OH}}{{\text{)}}_{\text{2}}}{\text{ + }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\)
CHXI13:HYDROCARBONS
317957
Match Column I with Column II and choose the correct combination from the options given. Column I Column II
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
CHXI13:HYDROCARBONS
317955
For the preparation of alkanes, aqueous solution of sodium or potassium salt of carboxylic acid is subjected to
1 hydrogenation
2 oxidation
3 electrolysis
4 hydrolysis
Explanation:
Electrolysis of aqueous solutions of sodium or potassium salts of fatty acids gives alkane having twice the number of carbon atoms present in the alkyl group of the acid. This process is kown as Kolbe's electrolytic reaction. \(2 \mathrm{RCOONa} \rightarrow 2 \mathrm{RCOO}^{-}+2 \mathrm{Na}^{+}\) At anode: \(2 \mathrm{RCOO}^{-}-2 \mathrm{e}^{-} \rightarrow 2 \mathrm{RCOO}\) \(\underset{\text { Unstable }}{2 \mathrm{RCOO}^{-}} \rightarrow \underset{\text { Alkane }}{\mathrm{R}}-\mathrm{R}+2 \mathrm{CO}_{2}\)
KCET - 2017
CHXI13:HYDROCARBONS
317956
Methane can not be prepared by
1 \(\mathrm{Al}_{4} \mathrm{C}_{3}\)
2 \(\mathrm{Be}_{2} \mathrm{C}\)
3 \(\mathrm{CaC}_{2}\)
4 \(\mathrm{CS}_{2}\)
Explanation:
Methane cannot be prepared by \(\mathrm{CaC}_{2}\). It on hydrolysis produces acetylene. Remaining other carbides produce alkanes. \({\text{A}}{{\text{l}}_{\text{4}}}{{\text{C}}_{\text{3}}}{\text{ + 12}}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{4Al(OH}}{{\text{)}}_{\text{3}}}{\text{ + 3C}}{{\text{H}}_{\text{4}}}\) \({\text{B}}{{\text{e}}_{\text{2}}}{\text{C + 2}}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{2BeO + C}}{{\text{H}}_{\text{4}}}\) \({\text{C}}{{\text{S}}_{\text{2}}}{\text{ + 2}}{{\text{H}}_{\text{2}}}{\text{S}}\xrightarrow[{{\text{ - 4C}}{{\text{u}}_{\text{2}}}{\text{S}}}]{{{\text{ + 8Cu}}}}{\text{C}}{{\text{H}}_{\text{4}}}\) \({\text{Ca}}{{\text{C}}_{\text{2}}}{\text{ + 2}}{{\text{H}}_{\text{2}}}{\text{O}} \to \mathop {\text{C}}\limits^{\text{.}} {\text{a(OH}}{{\text{)}}_{\text{2}}}{\text{ + }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\)
CHXI13:HYDROCARBONS
317957
Match Column I with Column II and choose the correct combination from the options given. Column I Column II
317955
For the preparation of alkanes, aqueous solution of sodium or potassium salt of carboxylic acid is subjected to
1 hydrogenation
2 oxidation
3 electrolysis
4 hydrolysis
Explanation:
Electrolysis of aqueous solutions of sodium or potassium salts of fatty acids gives alkane having twice the number of carbon atoms present in the alkyl group of the acid. This process is kown as Kolbe's electrolytic reaction. \(2 \mathrm{RCOONa} \rightarrow 2 \mathrm{RCOO}^{-}+2 \mathrm{Na}^{+}\) At anode: \(2 \mathrm{RCOO}^{-}-2 \mathrm{e}^{-} \rightarrow 2 \mathrm{RCOO}\) \(\underset{\text { Unstable }}{2 \mathrm{RCOO}^{-}} \rightarrow \underset{\text { Alkane }}{\mathrm{R}}-\mathrm{R}+2 \mathrm{CO}_{2}\)
KCET - 2017
CHXI13:HYDROCARBONS
317956
Methane can not be prepared by
1 \(\mathrm{Al}_{4} \mathrm{C}_{3}\)
2 \(\mathrm{Be}_{2} \mathrm{C}\)
3 \(\mathrm{CaC}_{2}\)
4 \(\mathrm{CS}_{2}\)
Explanation:
Methane cannot be prepared by \(\mathrm{CaC}_{2}\). It on hydrolysis produces acetylene. Remaining other carbides produce alkanes. \({\text{A}}{{\text{l}}_{\text{4}}}{{\text{C}}_{\text{3}}}{\text{ + 12}}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{4Al(OH}}{{\text{)}}_{\text{3}}}{\text{ + 3C}}{{\text{H}}_{\text{4}}}\) \({\text{B}}{{\text{e}}_{\text{2}}}{\text{C + 2}}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{2BeO + C}}{{\text{H}}_{\text{4}}}\) \({\text{C}}{{\text{S}}_{\text{2}}}{\text{ + 2}}{{\text{H}}_{\text{2}}}{\text{S}}\xrightarrow[{{\text{ - 4C}}{{\text{u}}_{\text{2}}}{\text{S}}}]{{{\text{ + 8Cu}}}}{\text{C}}{{\text{H}}_{\text{4}}}\) \({\text{Ca}}{{\text{C}}_{\text{2}}}{\text{ + 2}}{{\text{H}}_{\text{2}}}{\text{O}} \to \mathop {\text{C}}\limits^{\text{.}} {\text{a(OH}}{{\text{)}}_{\text{2}}}{\text{ + }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\)
CHXI13:HYDROCARBONS
317957
Match Column I with Column II and choose the correct combination from the options given. Column I Column II
317955
For the preparation of alkanes, aqueous solution of sodium or potassium salt of carboxylic acid is subjected to
1 hydrogenation
2 oxidation
3 electrolysis
4 hydrolysis
Explanation:
Electrolysis of aqueous solutions of sodium or potassium salts of fatty acids gives alkane having twice the number of carbon atoms present in the alkyl group of the acid. This process is kown as Kolbe's electrolytic reaction. \(2 \mathrm{RCOONa} \rightarrow 2 \mathrm{RCOO}^{-}+2 \mathrm{Na}^{+}\) At anode: \(2 \mathrm{RCOO}^{-}-2 \mathrm{e}^{-} \rightarrow 2 \mathrm{RCOO}\) \(\underset{\text { Unstable }}{2 \mathrm{RCOO}^{-}} \rightarrow \underset{\text { Alkane }}{\mathrm{R}}-\mathrm{R}+2 \mathrm{CO}_{2}\)
KCET - 2017
CHXI13:HYDROCARBONS
317956
Methane can not be prepared by
1 \(\mathrm{Al}_{4} \mathrm{C}_{3}\)
2 \(\mathrm{Be}_{2} \mathrm{C}\)
3 \(\mathrm{CaC}_{2}\)
4 \(\mathrm{CS}_{2}\)
Explanation:
Methane cannot be prepared by \(\mathrm{CaC}_{2}\). It on hydrolysis produces acetylene. Remaining other carbides produce alkanes. \({\text{A}}{{\text{l}}_{\text{4}}}{{\text{C}}_{\text{3}}}{\text{ + 12}}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{4Al(OH}}{{\text{)}}_{\text{3}}}{\text{ + 3C}}{{\text{H}}_{\text{4}}}\) \({\text{B}}{{\text{e}}_{\text{2}}}{\text{C + 2}}{{\text{H}}_{\text{2}}}{\text{O}} \to {\text{2BeO + C}}{{\text{H}}_{\text{4}}}\) \({\text{C}}{{\text{S}}_{\text{2}}}{\text{ + 2}}{{\text{H}}_{\text{2}}}{\text{S}}\xrightarrow[{{\text{ - 4C}}{{\text{u}}_{\text{2}}}{\text{S}}}]{{{\text{ + 8Cu}}}}{\text{C}}{{\text{H}}_{\text{4}}}\) \({\text{Ca}}{{\text{C}}_{\text{2}}}{\text{ + 2}}{{\text{H}}_{\text{2}}}{\text{O}} \to \mathop {\text{C}}\limits^{\text{.}} {\text{a(OH}}{{\text{)}}_{\text{2}}}{\text{ + }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}\)
CHXI13:HYDROCARBONS
317957
Match Column I with Column II and choose the correct combination from the options given. Column I Column II
