Alkanes Quiz
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5 questions, one answer each
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1. What is the general formula for alkanes?
- A. CnH2n
- B. CnH2n+2
- C. CnH2n+1OH
- D. CnH2n-2
2. Why are alkanes classed as saturated hydrocarbons?
- A. They contain oxygen atoms
- B. All their carbon-carbon bonds are single bonds
- C. They dissolve fully in water
- D. They contain a double bond
3. What provides the activation energy for the substitution reaction between an alkane and chlorine?
- A. Heat from a Bunsen burner only
- B. Ultraviolet light
- C. An added acid catalyst
- D. Electrical current
4. What is produced when methane reacts with chlorine under UV light (monosubstitution)?
- A. Ethene and water
- B. Chloromethane and hydrogen chloride
- C. Methanol and chlorine gas
- D. Carbon dioxide and hydrogen chloride
5. A chemist has a large sample of a long-chain alkane obtained from crude oil, but the market demands more petrol (a shorter-chain fraction) and alkenes for making plastics. Explain how the chemist can convert the long-chain alkane into these more useful products.
- A. By reacting it with chlorine under UV light to substitute hydrogen atoms
- B. By cracking it at high temperature with a catalyst, breaking it into shorter alkanes and alkenes
- C. By cooling it to a very low temperature to separate it by fractional distillation
- D. By simply burning it in excess oxygen to produce shorter hydrocarbons