CBSE Class 10 Science 2017 · Paper 31(B)/C · Question 8

Carbon and its Compounds 3 marks Medium

An organic compound ‘A’ (

C_{2} H_{6} O

) on reacting with acidified

K_{2} Cr_{2} O_{7}

forms another compound ‘B’. On adding a piece of sodium to ‘B’ a gas ‘X’ evolves which burns with a pop sound. Identify ‘A’, ‘B’ and ‘X’ and also write the chemical equations for the reactions involved.

Answer

A is ethanol, B is ethanoic acid and X is hydrogen gas.

'A' is ethanol,

C_{2} H_{5} OH

; 'B' is ethanoic acid (acetic acid),

CH_{3} COOH

; 'X' is hydrogen gas,

H_{2}

. Oxidation of A to B:

CH_{3} CH_{2} OH + 2 [O] acidified K_{2} Cr_{2} O_{7}, heat CH_{3} COOH + H_{2} O

B with sodium:

2 CH_{3} COOH + 2 Na \to 2 CH_{3} COONa + H_{2}

The hydrogen burns with a pop:

2 H_{2} + O_{2} \to 2 H_{2} O

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From the board paper

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CBSE Class 10 Science 2017 · Paper 31(B)/C · Question 8

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