1CHEMISTRY CHAPTER- HYDROCARBONS (I PUC) One mark questions 1.What type of structural isomerism is shown by alkanes? 2.Which metal is used in Wurtz reaction? 3.What happens when isopropyl bromide is subjected to Wurtz reaction? 4. What is the nature of mechanism of halogenation of alkanes? 5.Which conformation of ethane is most stable? 6.Can propane show chain isomerism? 7.Why are alkenes reactive in nature? 8.What is the state of hybridization of carbon atoms in ethene? 9.Which of the following show geometrical isomerism? CHCl = CHCl; CH2= CCl2; CCl2= CHCl 10.Name the halogen used o test unsaturation in a hydrocarbon? 11.Is peroxide effect applicable addition of HCl to propene? Give reason. 12.What is Bayer’s reagent? 13.What is Lindlar’s catalyst? 14.Name the reaction which locates the position of the double bond? 15.Give the tests to show that the given compound is an unsaturated compound. 16.Why alkynes does not show geometrical isomerism? 17.What happens when ethyne is hydrated with dilute solution of HgSO4and H2SO4? 18.Name the product formed when vapours of ethyne are passed through HCl solution? 19. Name the product when ethyne is reduced with Na in liquid ammonia? 20. What happens when vapours of ethyne are passed into red hot iron? 21. What is the nature of structure of benzene? 22. Why does benzene resist addition reactions? 23. Which catalyst is used in Friedel,s craft reaction? 24. Name two ortho and two meta directing groups in benzene? 25. What is the nature of substitution in benzene? 26. Who gave the present cyclic structure of benzene? 27. Which electrophile is formed during nitration of benzene? 28. What does LNG stand for? 29. Which hydrocarbon is main constitutent of CNG? Two mark questions 1. What is cracking / pyrolysis? 2. Write a short note on isomerization of alkanes? 3. Identify the products X and Y of the following reactions: Y Na +NH3, heat but-2-yne H2/ Pd/BaSO4, Heat X
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24. How will you prepare benzene from sodium benzoate? 5. What happens when benzene reacts with acetyl chloride in presence of AlCl3. Represent in form of chemical reaction . 6. Write the conditions necessary for geometrical isomerism 7. Which one is more polar, cis-but-2-ene or trans-but-2-ene and why? 8. Write the name of ozonolysis products of but-1-ene. 9. What happens when alk.KMnO4 is added to ethene? Write the reaction and the use of this reaction. 10. How is acetylene prepared on commercial scale? 11. Name the functional group of the compound prepared by reaction of propyne with water in presence of mercuric salt and sulphuric acid. 12. State Markovnikov's rule. 13. Name the acid whose sodium salt is required for the preparation of propane? Write chemical equation for the reaction. 14. Explain Wurtz reaction with an example. Where is it used? 15. Define decarboxylation with an example.
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