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Chemistry CIE iGCSE - Organic 1

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Q1- 2. Four fractions obtained from the fractional distillation of petroleum are bitumen, gasoline, diesel oil and naphtha.

Crude oil distiller
Terry Joyce | CC by S.A. 2.0

The fraction which …..  
1. ... has the highest boiling point is .
2. ….is used as a feedstock for making chemicals is .

3. Which statement about alkane molecules is correct?

  • A.   They contain carbon, hydrogen and oxygen atoms
  • B.   They burn in oxygen
  • C.   They contain double bonds
  • D.   They contain ionic bonds

4. The structures of four organic compounds are shown:

4 organic molecules

 
Which statement is NOT correct?
  • A.   Only three of the compounds are hydrocarbons
  • B.   Only two of the compounds are alkenes
  • C.   Only one of the compounds is unsaturated
  • D.   Only one of the compounds is an alcohol

 

Q5-8: Decane (C10H22) can be split into C3H6 and C7H16 by cracking.

 
5. The conditions for cracking are ….
  • A.  burn in a supply of oxygen
  • B.  heat gently with a silica catalyst
  • C.  high temperature (600-700oC) and an alumina catalyst
  • D.  high temperature (600-700oC) and a phosphoric acid catalyst

6. These compounds in order of increasing viscosity are …

  • A.   C10H22 , C3H6 , C7H16
  • B.   C10H22 , C7H16, C3H6
  • C.   C3H6 , C7H16 , C10H22
  • D.   C7H16 ,C3H6 , C10H22

7. Which of these compounds instantly decolourise bromine water?

  • A.   C10H22 only
  • B.   C3H6 only
  • C.   C10H22  and C7H16
  • D.   all three
8. What is the polymer formed from C3H6?
  • A.   poly(butane)
  • B.   poly(butene)
  • C.   poly(propane)
  • D.   poly(propene)

 

9. Which of the following are true for molecules in the same homologous series?

1. same general formula
2. same functional group
3. different chemical properties
 
  • A.   1 and 2 only
  • B.   2 and 3 only
  • C.   1 only
  • D.   1, 2 and 3

10. The general formula for the alkane homologous series is ……

  • A.   CnH2n-2
  • B.   CnH2n
  • C.   CnH2n+1
  • D.   CnH2n+2