Important Questions of Hydrocarbon

Very Short Answer Type Questions –

  1. Which metal is used in wurtz reaction?
  2. What is the state of hybridization of carbon atoms in ethane?
  3. What is Lindlar’s catalyst?
  4. How would you convert ethane into ethane molecule?
  5. Why do alkynes not show geometrical isomerism?
  6. How is alkyne prepared from calcium carbide?
  7. What is hydrogenation?
  8. Write the conversion of ethene to ethyne.
  9. Why are alkenes are reactive in nature?
  10. What is the product formed when ethyne is reduced with sodium in liquid ammonia?
  11. Which catalyst is used in fridel craft’s reaction?
  12. What happens when ethanol is heated with concentrated H2SO4?
  13. Define Frankland reaction.
  14. What is the limitation of wurtz reaction?
  15. Methane does not react with chlorine in dark.why?
  16. How the alkene is prepared by acidic dehydration?

Short Answer Type Questions –

  1. Why do alkenes prefer to undergo electrophilic addition reaction while arenes prefer electrophilic substitution reaction? Explain.
  2. State Markownikov’s rule.
  3. How is alkene prepared by kolbe’s method?
  4. What is fridel craft’s reaction? Give an example.
  5. Ethyne  is acidic in nature in comparison to ethene and ethane. Explain.
  6. What is Pyrolysis?
  7. Define decarboxylation with an example.
  8. How is alkene produced by vicinal dihalide?
  9. The boiling point of hydrocarbon decreases with increase in branching. Give reason.
  10. The intermediate carbocation formed in the reactions of HI, HBr and HCl with propene is the same and the bond energy of HCl, HBr and HI is 430.5 KJ/mol, 363.7 KJ/mol and 296.8 KJ/mol respectively. What will be the order of reactivity of these halogen acids.
  11. Give reason that chlorobenzene is less reactive towards electrophilic aromatic substitution than benzene.
  12. Why dry ether is used in wurtz reaction ?

Long Answer Type Questions –

  1. How will you convert –
  2. Ethyne to ethane
  3. Propyne to propanone
  4. Propene to ethyne
  5. Ethanoic acid to benzene
  6. Phenol to Benzene
  7. Benzene to m-chloronitrobenzene
  8. Benzene to acetophenone
  9. Ethyne to benzene
  10. Benzene underogoes electrophilic substitution reactions easily and Nucleophilic substitution with difficulty. Explain.
  11. Explain the mechanism involved in the chlorination of methane.
  12. In the presence of peroxide addition of HBr to propene takes place according to anti – Markovnikov’s rule but peroxide effect is not seen in case of HCl and HI. Explain.
  13. Complete the following reaction –
  1. CH2 ═ CH2     +      Br2       ->
  •  BrCH2 — CH2Br  +   KOH (alc.)   —->
  • (CH3)2C ═ CH2 + O3  —> A   +   Zn/H2O —->    B + C
  • CH3CH2 CH ═ CHCH3  + HBr   —>
  • CH2 ═ CH2  +  H2O / dil KMnO4  ——>   
  • Explain with the help of resonating structures when –NO2 attached to the benzene ring is meta – directing.

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