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ICSE Class 10 Chemistry Question 22 of 23

Solved Sample Paper 2 — Question 22

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Question

Question 8(ii)

(a) State the condition required for the following reactions.

(1) Conversion of methyl chloride to dichloromethane.

(2) Conversion of ethanol to ethene.

(b) Give the reaction involved in the formation of methyl acetate (ester).

Answer

(a) (1) methyl chloride converts to dichloromethane under diffused sunlight, ultraviolet light or high temperature [400°C]

CH3Clmethylchloride+Cl2[excess]⟶CH2Cl2dichloromethane+HCl\underset{\text{methylchloride} }{\text{CH}_3\text{Cl}} + \underset{\text{[excess]}}{\text{Cl}_2} \longrightarrow \underset{\text{dichloromethane}}{\text{C}\text{H}_2\text{Cl}_2}+ \text{HCl}

(2) By heating ethyl alcohol with concentrated H2SO4 at 170°C.

C2H5OH ethyl alcohol→170°CConc. H2SO4[excess]C2H4ethene+H2O \underset{\text{ ethyl alcohol}}{\text{C}_2\text{H}_5\text{OH}} \xrightarrow[170\degree\text{C}]{\text{Conc. H}_2\text{SO}_4\text{[excess]}} \underset{ \text{ethene}}{\text{C}_2\text{H}_4} + \text{H}_2\text{O}\

(b)

CH3OHmethyl alcohol+CH3COOHacetic acid→Conc. H2SO4CH3−COO−CH3methyl acetate+H2O\underset{\text{methyl alcohol}}{\text{CH}_3\text{OH}} + \underset{\text{acetic acid}}{\text{CH}_3\text{COOH}} \xrightarrow{\text{Conc. H}_2\text{SO}_4} \underset{\text{methyl acetate}}{\text{CH}_3-\text{COO}-\text{CH}_3} + \text{H}_2\text{O}