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ICSE Class 10 Chemistry Question 81 of 93

Organic Chemistry — Question 81

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81
Question

Question 6(2019)

Give balanced chemical equations for the preparation of :

(i) Ethene from bromoethane

(ii) Ethyne using calcium carbide

(iii) Methane from sodium acetate.

Answer

(i) Ethene from bromoethane

C2H5-Br Bromoethane [ethyl bromide]+KOH alcoholic KOH→boilH2C=CH2 ethene [ethylene]+KBr+H2O\underset{\text{ Bromoethane [ethyl bromide]}}{\text{C}_2\text{H}_5\text{-Br}} + \underset{\text{ alcoholic KOH}}{\text{KOH}} \xrightarrow{\text{boil}} \underset{ \text{ ethene [ethylene]} } {\text{H}_2\text{C}=\text{C}\text{H}_2} + \text{KBr} + \text{H}_2\text{O}

(ii) Ethyne from calcium carbide

CaC2calcium carbide+2H2Ocold water⟶C2H2ethyne [acetylene]+Ca(OH)2\underset{\text{calcium carbide}}{\text{CaC}_2} + \underset{\text{cold water}}{2\text{H}_2\text{O}} \longrightarrow \underset{\text{ethyne [acetylene]}}{\text{C}_2\text{H}_2} + \text{Ca(OH)}_2

(iii)

CH3.COONa sodium acetate+NaOHsodalime→CaOΔCH4methane+Na2CO3\underset{\text{ sodium acetate}}{\text{CH}_3\text{.COONa}} + \underset{\text{sodalime}}{\text{NaOH}} \underset{\Delta}{\xrightarrow{\text{CaO}}} \underset{\text{methane}}{\text{C}\text{H}_4} + \text{Na}_2\text{CO}_3