1. Multiple Choice Questions (MCQs)
What Alkenes have one or more double bonds between carbon atoms? They have the general formula . When two carbon atoms share two pairs of electrons, they form a double bond between the carbon atoms. How many electrons are left on each carbon atom?
- a) 2
- b) 3
- c) 1
- d) 4
The type of bond present between the carbon atoms in alkynes is:
- a) Single covalent bond
- b) Double covalent bond
- c) Triple covalent bond
- d) Saturated covalent bond
Alkenes are classified as:
- a) Saturated hydrocarbons
- b) Unsaturated hydrocarbons
- c) Aromatic hydrocarbons
- d) None of the above
Cracking of large alkane molecules requires:
- a) Low temperature and pressure
- b) High temperature and catalyst
- c) Low temperature and catalyst
- d) High temperature and high pressure
Which of the following is a product of cracking large alkane molecules?
- a) Carbon dioxide
- b) Alkenes
- c) Water
- d) Hydrogen
The chemical test to distinguish between alkanes and alkenes involves:
- a) Limewater
- b) Bromine water
- c) Litmus paper
- d) Universal indicator
Alkyne contain which type of carbon- carbon bond?
- a) Single covalent bond
- b) Double covalent bond
- c) Triple covalent bond
- d) Saturated covalent bond
Ethyne is commonly used for:
- a) Cooking
- b) Welding
- c) Fuel for cars
- d) Heating
Fractional distillation separates petroleum into fractions based on:
- a) Density
- b) Boiling point
- c) Viscosity
- d) Solubility
Which property increases as you move from the bottom to the top of the fractionating column?
- a) Volatility
- b) Chain length
- c) Boiling point
- d) Viscosity
The gasoline/petrol fraction from petroleum is primarily used for:
- a) Jet fuel
- b) Heating
- c) Car fuel
- d) Chemical feedstock
Doubly bonded carbon atoms form which type of bond with two other atoms.
- a) Single
- b) Double
- c) Trible
- d) Non
2. Short Answer Questions
i. Describe the bonding in alkenes.
ii. What are the conditions required for the cracking of alkanes?
iii. Why is the cracking of large alkane molecules important in the petroleum industry?
iv. How can you test for the presence of an unsaturated hydrocarbon?