1) Is the molecule an alkene or an alkane?  a) Alkane b) Alkene c) Haloalkane d) Neither 2) Which of the following molecules belong in the same homologous series? a) CH3CH2CH2CH3 b) CH2CH2 c) CH3CH3 d) CH3CH3Br e) CH3CH2CHCH2 3) Which of the following molecules are saturated molecules? a) CH3CH3 b) CH3CH2CH2CHCH2 c) CH3CH2CH2CH3 d) CH2CH2 4) Which of the following molecules are unsaturated molecules? a) CH3CHCH2 b) CH3CH2CH2CH3 c) CH3CH2CH2CH2CH2CH3 d) CH3CH2CH2CHCH2 5) An alkane has 50 carbon atoms. How many hydrogen atoms does it have?  a) 100 b) 50 c) 102 d) 52 6) An alkene has 94 hydrogen atoms. How many carbon atoms does it have?  a) 94 b) 46 c) 45 d) 47 7) An alkane has 4 carbon atoms. What is the name of this alkane? a) Methane b) Butene c) Butane d) Propane 8) An alkene has 4 hydrogen atoms. What is the name of this alkene? a) Methane b) Butene c) Butane d) Ethene 9) What is the name, molecular formula and structural formula of the molecule in the image? a) Pentane, C5H10, CH3CH2CH2CH2CH3 b) Butane, C4H12, CH3CH2CH2CH3 c) Pentane, C5H12, CH3CH2CH2CH2CH3 d) Pentene, C5H12, CH3CH2CHCHCH3 10) What is the name, molecular formula and structural formula of the molecule in the image? a) Butane, C4H12, CH3CH2CH2CH3 b) Propane, C3H6, CH3CHCH2 c) Propene, C3H8, CH3CHCH2 d) Propene, C3H6, CH3CHCH2 11) Methane, CH4, is reacted with bromine. Which of the following equations correctly describes this reaction? a) CH4 + Br --> CH3Br + HBr b) CH4 + Br2 --> CH4Br + HBr c) CH4 + Br2 --> CH3Br + HBr d) CH3 + Br2 --> CH3Br + HBr 12) Which of the following reactions are examples of substitution reactions and why? a) CH4 + 2O2 --> CO2 + 2H2O. Hydrogen atoms are replaced by oxygen atoms.  b) CH3Cl + Cl2 --> CH2Cl2 + HCl. Hydrogen atom is replaced by a chlorine atom.  c) 2H2 + O2 --> 2H2O. Oxygen and hydrogen combine to form water. d) CH4 + Br2 --> CH3Br + HBr. Hydrogen atom is replaced by a bromine atom. 13) Which of the following reactions are examples of addition reactions and why?  a) C2H4 + Br2 --> C2H4Br2 b) CH4 + Br2 --> CH3Br + HBr c) CH3Cl + Cl2 --> CH2Cl2 + HCl d) C5H10 + H2 --> C5H12 14) Ethene is reacted with Cl2, what is the name and structural formula of the molecule produced? a) Chloroethane: CH2ClCH3 b) Dichloroethane: ClCH2CH2Cl c) Dichloroethane: ClCH3CH3Cl d) Chloroethane: ClCH2CH2Cl 15) How was this molecule produced and what type of reaction has taken place?  a) By reacting propane and chlorine. It is a substitution reaction.  b) By reacting CH2CH2CH3 and Cl2. It is an addition reaction.  c) By reacting CH2CHCH3 and Cl2. It is an addition reaction.  d) By reacting propene and Cl. It is a substitution reaction. 16) What has happened in the picture? a) Bromine water has been decolourised by the presence of alkanes.  b) Clear solution of alkenes has turned bromine water orange. c) Bromine water has been decolourised by the presence of alkenes.

Organic chemistry revision lesson (Wellington College) MCQ

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