Question

A organic compound A on heating with conc.H2SO4 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 mole of Co2 and 3 mole of H2O . Identify A B C and write chemical equation of each reaction.

Answer 1



Akanksha Dhar asked in Science

An organic compound A on heating with conc.H2SO4 forms a compound B which on addition of one mole of hydrogen in presence of Nickle forms a compound C.One mole of C on combustion forms 2 moles of CO2 and 3 moles of H20. Identify the compounds A,B,C and write the equations for the reactions involved.

PLEASE HELP! :O

SHARE

 6

 Follow0



Kirti Gogia answered this
12191 helpful votes in Science, Class XI-Science

We are given that the compound B on addition of one mole of H2 in the presence of Ni forms another compound. This suggests that the compound B is unsaturated. Since the compound B is formed by dehydration of compound A by using H2SO4, it means that compound A is an alcohol. Compound C will be alkane (alkenes on hydrogenation give alkanes). As compound C gives two molecules of CO2 and three molecules of H2O, it means that it is an alkane containing two carbon atoms. Thus

Compound A = CH3CH2OH

Compound B = CH2=CH2

Compound C = CH3-CH3

Following are the chemical equations
C2H5OH+H2SO4=C2H4
C2H2+H2=(Nickel catalyst) =====C2H6
2C2H6+7O2====4CO2 +6H2O

Answer 2

As given the compound A forms compound B on reaction with H2SO4.

and B is undergoes addition reaction when gets in touch with hydrogen in the presence of Nickel. This make B a unsaturated compund.

Also, compound C undergoes combustion and forms two molecules of CO₂ and 3 molecules of H₂O. This is the same thing that ethene do. 

So the reaction is: C₂H₆ + 2O₂ → 2CO₂ + 3H₂O So, this makes C an ethane.

Ethane is formed on hydrogenation of ethene with one molecule of hydrogen in the presence of nickel.  C₂H₄ + H₂→C₂H₆ and finally Ethanol on dehydration with H₂SO₄ forms ethene

hope this is fine for you :-)