Class - X Chapter: Carbon and Its Compounds
1.Q. What happen when few drops of alkaline KmNO4 added to Ethanol?
Ans: In the begging color of KmNO4 disappear. When excess KmNO4 is dissolved in solution colour cannot disappear because whole Ethanol gets oxidized into Ethanoic acid.
CH3CH2OH ----- KmNO4------Heat------->CH3COOH
Hence, alkaline KmNO4or Acidified K2Cr2O7 oxidized alcohol into ethanoic acid
2.Q. How can we convert unsaturated hydrocarbon into saturated hydrocarbon?
Ans: By the addition reaction of unsaturated hydrocarbon with halo atom in the presence of catalyst.
HC=CH +H2 -------------Ni--------5700 K------> Ch3-CH3
R2C=CR2 + H2 ------------Ni---------> R2HC-CHR2 (Vegetable Gee)
This reaction is known as Hydrogenation reaction.
3. Q. How can you test that given hydrocarbon is unsaturated?
Ans: When few drops of Bromine is added to unsaturated hydrocarbon its colour disappear due to addition reaction.
For example: If drops of bromine water added to ethyne, the colour of Bromine disappear due to addition reaction. HC≡CH + Br2 -------------> HBr2 C – CHBr2 (Tetra room ethane is formed)
4. Q. How can you prepare alkenes from Ethanol?
Ans: When Ethanol heated in presence of Conc.H2SO4 or Al2O3 at 6230C ,Ethanol loose water molecules and form alkenes. C2H5OH ---H2SO4------6230C------>CH2=CH2 + H2O
5. Q. What happen when a piece of sodium metal added to Ethanol?
Ans: Sodium ethoxide is formed with evolution of H2 gas
C2H5OH + Na -------------> C2H5ONa + H2
6. Q. What happens when few drops of Conc.H2SO4 is added to Solution of Ethanoic acid and Ethanol?
Ans: A substance with fruity smell is formed called Ester.This reaction is known as Esterification
C2H5OH + CH3COOH ------H2SO4------> CH3COO C2H5 (Ester or, Ethyl Ethanoate)
7. Q. What types of flame produce by burning of Benzene, Nepthline and Camphor?
Ans: Smoky flame due presence of excess carbon content.
8. Q. What is Gasol?
Ans: The mixture of petrol with alcohol up to 20% is known gasol.
9.Q. Why Acetic acid is called glacier acid?
Ans: Acetic acid freezes at 290K in cold weather and form crystals.This is why acetic acid is called glacier acid.
10.Q. What is saponification?
Ans: When sodium hydroxide react with ester and form alcohol and sodium Ethanoate. This reaction is used to form soap So this reaction is known as saponification.
CH3COO C2H5 + NaOH ------------> CH3COONa + C2H5OH
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