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Stoichiometry

A carbon comp...

Question

A carbon compound 'P' on heating with excess conc. $H_{2} S O_{4}$ 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, R and write chemical equations for the reactions involved.

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Solution

Q on reacting with hydrogen in presence of catalyst forms a saturated compound. Hence, Q will be an unsaturated compound. P is an alcohol which on dehydration with conc. $H_{2} S O_{4}$ forms an alkene. Alkane on combustion forms $C O_{2}$ and $H_{2} O$ .

P:- $C H_{3} C H_{2} O H$
Q:- $C H_{2} = C H_{2}$
R:- $C H_{3} C H_{3}$

$C H_{3} C H_{2} O H c o n c . H_{2} S O_{4} - ------ \to Δ C H_{2} = C H_{2} + H_{2} O$

$C H_{2} = C H_{2} + H_{2} N i \to C H_{3} C H_{3}$

$C H_{3} C H_{3} + O_{2} \to 2 C O_{2} + 3 H_{2} O$

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