CBSE Class 10 Science 2018 · Paper 31/1 · Question 3

Carbon and its Compounds 2 marks Medium

A compound ‘X’ on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound ‘Y’. ‘X’ also reacts with sodium metal to evolve a colourless gas ‘Z’. Identify ‘X’, ‘Y’ and ‘Z’. Write the equation of the chemical reaction of formation of ‘Y’ and also write the role of sulphuric acid in the reaction.

Answer

X is ethanol, Y is ethene and Z is hydrogen; concentrated sulphuric acid acts as a dehydrating agent.

X: ethanol,

C_{2} H_{5} OH

Y: ethene,

C_{2} H_{4}

(

CH_{2} = CH_{2}

) Z: hydrogen,

H_{2}

, given off as

2 CH_{3} CH_{2} OH + 2 Na \to 2 CH_{3} CH_{2} ONa + H_{2}

Formation of Y:

CH_{3} -CH_{2} OH hot conc. H_{2} SO_{4} 443 K CH_{2} = CH_{2} + H_{2} O

Role of sulphuric acid: concentrated sulphuric acid acts as a dehydrating agent; it removes water from ethanol.

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CBSE Class 10 Science 2018 · Paper 31/1 · Question 3

Answer

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