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Standard XII

Chemistry

Preparation of Alcohols from Carbonyl Compounds

An organic li...

Question

An organic liquid A, containing C, H and O, has a pleasant odour with the boiling point of $78^{0} C$ . Upon boiling A with conc. $H_{2} S O_{4}$ , a colourless gas B is produced which decolourises bromine water and alkaline $K M n O_{4}$ . The organic liquid A is :

C H_{3} O H

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C_{2} H_{5} C H O

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C_{2} H_{6}

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C_{2} H_{5} O H

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Solution

The correct option is B $C_{2} H_{5} O H$
$C_{2} H_{5} O H$ on heating with conc. $H_{2} S O_{4}$ produces $C_{2} H_{4}$ .

This is ethene, which decolourises bromine water and alkaline $K M n O_{4}$ solution due to unsaturation.

Option D is correct.

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An organic liquid A, containing C, H and O, has a pleasant odour with the boiling point of 780C. Upon boiling A with conc. H2SO4, a colourless gas B is produced which decolourises bromine water and alkaline KMnO4. The organic liquid A is :

The correct option is B C2H5OHC2H5OH on heating with conc. H2SO4 produces C2H4.This is ethene, which decolourises bromine water and alkaline KMnO4 solution due to unsaturation. Option D is correct.

An organic liquid A, containing C, H and O, has a pleasant odour with the boiling point of $78^{0} C$ . Upon boiling A with conc. $H_{2} S O_{4}$ , a colourless gas B is produced which decolourises bromine water and alkaline $K M n O_{4}$ . The organic liquid A is :

The correct option is B $C_{2} H_{5} O H$
$C_{2} H_{5} O H$ on heating with conc. $H_{2} S O_{4}$ produces $C_{2} H_{4}$ .

This is ethene, which decolourises bromine water and alkaline $K M n O_{4}$ solution due to unsaturation.

Option D is correct.