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Chemical Properties of Alcohol

an organic co...

Question

an organic compound A on heating with concentrated sulphuric acid forms a compound B which on addition of one mole of hydrogen in presence of Nickel forms a compound C. one mole of this compound on combustion forms three moles of CO2 and three moles of H2O. identify the compounds A , B C write the chemical equations of the reactions involved.

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Solution

Plz. check your question as compound C on combustion should give 2 moles of CO₂ and 3 moles of H₂O.

Accordingly, following is the answer.

Compound C on combustion should give 2 moles of CO₂ and 3 moles of H₂O.Therfore, its molecular formula should be C₂H₆ and the compound is ethane.
Compound C is formed is addition of 1 mole of H₂ to B .Therefore, the molecular formula of B should be C₂H₄ and the compound is ethene.
Compound b is formed by heating compound A with conc. sulphuric acid which is a dehydrating agent.So, compound A should be C₂H₅OH (ethanol).
The reactions are as follows:
$C_{2} H_{5} O H \overset{c o n c . s u l p h u r i c a c i d}{\to} C H_{2} = C H_{2} (A) (B) C H_{2} = C H_{2} + H_{2} \overset{N i}{\to} C H_{3} - C H_{3} (B) (C) C H_{3} - C H_{3} + \frac{7}{2} O_{2} \to 2 C O_{2} + 3 H_{2} O (C)$

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