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Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds5 Marks
Question
An organic compound A on heating with concentrated $H _2 SO _4$ forms a compound B which on addition of one mole of hydrogen in presence of Ni forms a compound C . One mole of compound C on combustion forms two moles of $CO _2$ and 3 moles of $H _2 O$. Identify the compounds $A , B$ and C and write the chemical equations of the reactions involved.
✓

Answer

Since one mole of compound C on combustion forms two moles of $CO _2$ and three moles of $H _2 O$ the compound C is a hydrocarbon with formula $C _2 H _6$. It is ethane. The compound B which forms $C _2 H _6$ upon addition of hydrogen is ethene $\left( C _2 H _4\right)$. The organic compound A which forms ethene upon acidic dehydration is ethanol. The chemical equations for the reactions involved are::$\text{C}_2\text{H}_5\text{OH}\xrightarrow[\ \ \ \text{heat}\ \ \ ]{\ \text{H}_2\text{SO}_4\ }\text{CH}_2=\text{CH}_2\xrightarrow[\ \ \text{heat}\ \ \ ]{\ \ \text{H}_2\text{Ni}\ \ }\text{CH}_3-\text{CH}_3\\\text{Ethanol (A)}\ \ \ \ \ \ \ \ \ \text{Ethene (B)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Ethane (C)}$
$\text{C}_2\text{H}_6+3\text{O}_2\xrightarrow{\ \ \ \ (\text{Combustion})\ \ \ }2\text{CO}_2+3\text{H}_2\text{O}\\\ \ (\text{C)}$

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