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Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds5 Marks
Question
A carbon compound ‘P' on heating with excess cont. $H2SO_4$ forms another carbon compound ‘Q' which on addition of hydrogen in the presence of nickel catalyst forms a saturated carbon compound ‘R'. One molecule of ‘R' on combustion forms two molecules of carbon dioxide and three molecules of water. Identify P, Q and R and write chemical equations for the reactions involved.
✓

Answer

Compound Q is ethene $= CH _2= CH _2+ H 2 O$
Compound R is ethane $= CH _2- CH _3$ Reaction:${\text{C}_{2}\text{H}_{5}\text{OH}}\xrightarrow[\Delta]{\text{Conc. } \text{H}_{2}\text{SO}_{4}}{\text{CH}_{2}} = \text{CH}_{2}+\text{H}_{2}\text{O} \\ $
$\text{CH}_{2}=\text{CH}_{2}\xrightarrow[\text{H}_{2}]{\text{Nickel Catalyst}}{\text{CH}_{3}-\text{CH}_{3}} + \text{H}_2\text{O} \\$
$\text{CH}_{3}-\text{CH}_{3}+\frac{7}{2}\text{O}_{2}\rightarrow 2\text{CO}_{2}+ 3\text{H}_{2}\text{O}$

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