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ICSE Class 10 Chemistry Question 10 of 93

Organic Chemistry — Question 10

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10
Question

Question 9

How would you convert:

(a) ethyl bromide into ethene

(b) ethene into 1,2-dibromoethane

(c) ethene into ethane

Answer

(a) ethyl bromide into ethene : Dehydrohalogenation

C2H5Br Bromo ethane [ethyl bromide]+KOHalcoholic, hot and conc.⟶C2H4ethene [ethylene]+KBr+H2O\underset{\text{ Bromo ethane [ethyl bromide]}}{\text{C}_2\text{H}_5\text{Br}} + \underset{\text{alcoholic, hot and conc.}}{\text{KOH}} \longrightarrow \underset{\text{ethene [ethylene]}}{\text{C}_2\text{H}_4} + \text{KBr} + \text{H}_2\text{O}

(b) ethene into 1,2-dibromoethane : Halogenation

C2H4 ethene+Br2→[inert solvent]CCl4C2H4Br21,2, dibromooethane [ethylene bromide]\underset{\text{ ethene}}{\text{C}_2\text{H}_4} + \text{Br}_2 \xrightarrow[\text{[inert solvent]}]{\text{CCl}_4} \underset{\text{1,2, dibromooethane [ethylene bromide]}}{\text{C}_2\text{H}_4\text{Br}_2}

(c) ethene into ethane : Hydrogenation

H2C=CH2 ethene [ethylene]+H2→200°CNickleC2H6ethane\underset{\text{ ethene [ethylene]}}{\text{H}_2\text{C}=\text{C}\text{H}_2} + \text{H}_2 \xrightarrow[200\degree\text{C}]{\text{Nickle}} \underset{\text{ethane}}{\text{C}_2\text{H}_6}