Alkanes and Alkenes

Which of the following statements explains why carbon is able to form many different compounds?

• Carbon can have variable oxidation states in compounds

• Carbon forms covalent bonds readily

• Carbon reacts vigorously with many elements.

• Carbon loses electrons readily

The above apparatus was used to investigate the products of combustion of a candle. It was found that water is collected in X and the limewater in Y formed white precipitate. What conclusion can be drawn about the elements that the candle contain?

• Candle contains carbon and hydrogen only.

• Candle contains carbon and hydrogen.

• Candle contains carbon, hydrogen and oxygen only.

• Candle contains carbon, hydrogen and oxygen.

In an experiment, 1 dm³ of an alkene undergo complete combustion to give 2 dm³ of carbon dioxide, all gas volumes being measured at r.t.p. Which one of the following shows the volume of oxygen used in the experiment?

 

• 2 dm³

• 2.5 dm³

• 3 dm³

• 3.5 dm³

• 1, 2 and 4

• 2 and 3 only

• 2, 3 and 5

• 2 and 4 only

Which of the following statements about the members of a homologous series is correct?

• They undergo similar reactions.

• They have the same empirical formula.

• They have the same percentage composition by mass.        

1 mole of propane was mixed with 1 mole of chlorine in the presence of sunlight to form a monosubstituted product. What is most probably the ratio of 1-chloropropane: 2-chloropropane that is formed?

• 1:2

• 2:1

• 1:3

• 3:1

Which of the following could not be produced when methane reacts with chlorine in the presence of ultraviolet light?

• hydrogen chloride

• tetrachloromethane

• chloromethane

• hydrogen gas

What is the structural formula of the compound formed by the addition of bromine to propene, CH₃CH=CH₂?    

• A

• B

• C

• D

• 1

• 2

• 3

• 4

Similar amounts of some fats and oils are dissolved in tetrachloromethane.  A few drops of bromine water are added and each mixture is shaken. The table shows the results.  Which fat or oil is the highest in polyunsaturates?

• A

• B

• C

• D