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  • An organic compound A on heating with concentrated H_2SO_4 forms a compound B which on addition of one mole of hydrogen in presence of Ni forms a compound C.

An organic compound A on heating with concentrated H_2SO_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_2O. Identify the compounds A, B and C and write the chemical equations of the reactions involved.

Answers (1)

As the compound on combustion forms two moles of carbon dioxide and 3 moles of water, it means that 2 carbon atoms and 6 hydrogen atoms are present. So molecular formula is C2H6 (ethane).

C_2H_6 + 3.5 O_2 \rightarrow 2CO_2 + 3H_2O

Compound A is ethanol (CH3CH2OH). On dehydrogenation, it gives ethene.

C_2H_5OH \overset{Hot conc. H_{2}SO_{4}}{\rightarrow}C_{2}H_{4}+H_{2}O

Compound B is ethene (CH_2=CH_2)

Compound is C is obtained by addition of 1 mole hydrogen in presence of nickel to B which means C is ethane

C_{2}H_{4}+H_{2}\overset{Ni}{\rightarrow}C_{2}H_{6}

Compound C is CH_3-CH_3

C_{2}H_{6}+7O_{2}\rightarrow4CO_{2}+6H_{2}O+Heat+Light

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