Hydrocarbons: Solved Exercise and Think-Tank

Question 2: Give short answers.

I. Give three examples of unsaturated hydrocarbon.

ii. Draw electron dot and cross structure for ethene.

iii. Draw structural formula of an alkane an alkene and an alkyne containing 5 carbon atoms.

iv. How can you differentiate ethane from ethene.

v. What do you mean by dehydration reaction? give one example.

Question 3: How can you convert:

I. ethene into ethane

ii. methane into carbontetrachloride

iii. ethane into glycol

iv. ethyl chloride into ethane

v. ethyl bromide into ethene

Question 4; Write a chemical equation to show the preparation of an alken from an alkene and alkyne.

Question 5: Write a chemical equation to show the preparation of Ethane from dehydration of an alcohol and dehydrohalogenation of alkyl halide.

Question 6: Wriite a chemical equation to show the preparation of ethyne from the dehalogenation of 1,2- dihalide and a tetra halide.

Question 7: Write chemical equations showing reaction of KMnO4 with ethene and ethyne.

Question 8: List some industrial uses of ethne and ethyne.

Question 9: Explain why schematic method of naming chemical compound is necessary?

Question 10: Draw electron dot and cross structure for

a. Propane b. Propyne c. Propene

Think Tank

Question 11: write chemical equation for the preparation of propene from

a. CH3-CH2-CH2-OH b. CH3-C=CH

Question 12: Write down structural formulas for the products which are formed when 1-butene is reacted with

a. H2/Ni b. dil alkaline aqueous KMnO4 solution

Question 13: Identify A, B, C, D in the following reactions.

i. Propene + Br2 ---------> A + alcohol KOH -------> B

ii. Ethyl alcohol + conc. H2SO4--------> C + Br2 ------> D

Question 14: construct a scheme to convert ethene into ethyne.

Question 15: You are given to flammable liquid hydrocarbon one of them is an alkene and the other is an alkane. Design an experiment to find out which is which.

Question 16: how many possible products are there when chlorine reacts with alkane? Sketch them all.

Question 17: Differentiate between ethene and ethyne.

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