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ICSE Class 10 Chemistry Question 18 of 23

Solved Sample Paper 4 — Question 18

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Question

Question 7(iii)

Give balanced chemical equation for the following.

(a) Preparation of ethyne from (ethylene dibromide) 1, 2-di bromoethane.

(b) Ethanoic acid from ethanol.

(c) Sodium acetate from acetic acid.

Answer

(a) Ethyne from (ethylene dibromide) 1, 2-di bromoethane.

C2H4Br2 ethylene dibromide+2KOH [aq.] alcoholic KOH→boilC2H2 Ethene [ethylene]+2KBr+2H2O\underset{\text{ ethylene dibromide}}{\text{C}_2\text{H}_4\text{Br}_2} + \underset{\text{ alcoholic KOH}}{\text{2KOH [aq.]}} \xrightarrow{\text{boil}} \underset{\text{ Ethene [ethylene]} }{\text{C}_2\text{H}_2} + \text{2KBr} +\text{2H}_2\text{O}

(b) Ethanoic acid from ethanol.

C2H5OHethanol→K2Cr2O7[acidified][O]CH3CHOethanal→K2Cr2O7[acidified][O]CH3COOHethanoic acid\underset{ \text{ethanol}}{\text{C}_2\text{H}_5\text{OH}} \xrightarrow[\underset{\text{[acidified]}}{\text{K}_2\text{Cr}_2\text{O}_7}]{\text{[O]}} \underset{\text{ethanal}}{\text{CH}_3\text{CHO}} \xrightarrow[\underset{\text{[acidified]}}{\text{K}_2\text{Cr}_2\text{O}_7}]{\text{[O]}} \underset{ \text{ethanoic acid} }{\text{CH}_3\text{COOH}}

(c) Sodium acetate from acetic acid.

CH3COOH + NaOH ⟶ CH3COONa + H2O