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ICSE Class 10 Chemistry Question 33 of 93

Organic Chemistry — Question 3

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Question

Question 3(2008)

Write the equation for the following :

(i) Calcium carbide and water

(ii) Ethene and water (steam)

(ii) Bromoethane and an aqueous solution of sodium hydroxide

Answer

(i) Calcium carbide and water: forms ethyne [acetylene]

CaC2calcium carbide+2H2Owater⟶C2H2ethyne [acetylene]+Ca(OH)2\underset{\text{calcium carbide}}{\text{CaC}_2} + \underset{\text{water}}{2\text{H}_2\text{O}} \longrightarrow \underset{\text{ethyne [acetylene]}}{\text{C}_2\text{H}_2} + \text{Ca(OH)}_2

(ii) Ethene and water (steam): form Ethanol [ethyl alcohol]

C2H4Ethene+H2Owater[steam]→acidH+C2H5OHethanol\underset{\text{Ethene}}{\text{C}_2\text{H}_4} + \underset{\text{water[steam]}}{\text{H}_2\text{O}} \xrightarrow[\text{acid}]{\text{H}^+} \underset{\text{ethanol}}{\text{C}_2\text{H}_5\text{OH}}

(iii) Bromoethane and an aqueous solution of sodium hydroxide: form Ethanol [ethyl alcohol]

C2H5Brbromoethane+NaOHaq. sodium hydroxide⟶C2H5OHEthanol [ethyl alcohol]+NaBr\underset{\text{bromoethane}}{\text{C}_2\text{H}_5\text{Br}} + \underset{\text{aq. sodium hydroxide}}{\text{NaOH}} \longrightarrow \underset{\text{Ethanol [ethyl alcohol]}}{\text{C}_2\text{H}_5\text{OH}} + \text{NaBr}