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Cbse chemistry class 10.
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Answers
A carbon compound P on heating with excess conc. H2SO4 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 2 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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The compound 'P' is Ethanol. When it is heated with concentrated sulphuric acid, it gets dehydrated and forms Ethene. So, the compound 'Q' is Ethene.
R is combusted.thats is,it is burnt with 2molecules of CO2 and 3 molecules of H2O.
ethen is the compound which does that.
thus compound R ---ethane.
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(Q) When Hydrogen is added to Ethane, in presence of Ni catalyst. it forms an unsaturated hydrocarbon i.e. Ethane. So, the compound 'R' is Ethane.
nickel catalst
C₂H₄ ---------------------C₂H₆ shows addition reaction.
H2
thus compound Q is ethene.
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(R) On combustion reaction of ethane, the products formed are:
h2so4
C2H5OH ------------------> CH2=CH2 + H2O.
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thus, compound P =ethanol compound Q =ethene compound R =ethane
What are the two properties of carbon?
The two properties of carbon :-
1) Catenation
2) Tetravalence
ANSWER !!
P =ethanol
Q =ethene
R =ethane
The two properties of carbon :-
● Catenation
● Tetravalence