MCQ Questions

Question No. 1

Some organic reactions can be classified as elimination, substitution, addition or oxidation. Write down to which group each reaction belongs.

Answer :

a) 2CH₄O + 3O₂ → 2CO₂ + 4H₂O

b) C₂H₆O + CH₄ → H₂O

c) 2C₄H₁₀ + O₂ → 2CO + H₂O

d) C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂

e) C₂H₅NH₂ + HBr → C₂H₅NH₃⁺ + Br⁻

Question No. 2

Explain why ethanol is very soluble in water, but hexan-1-ol is only slightly soluble.

Answer :

Question No. 3

Look at the list below. Explain why the boiling points of the following compounds differ.

Answer :

a) ethane and ethanol

b) methanol and ethanal

c) propan-1-ol and ethan-1,2-diol

Question No. 4

1-bromopropane is dissolved in ethanol. The solution is allowed to react with aqueous sodium hydroxide. Write a balanced equation for the reaction that occurs. Use condensed structural formula.

Answer :

Question No. 5

Give the IUPAC names for the following molecules:

Answer :

a) [structure a]

b) [structure b]

c) [structure c]

d) [structure d]

e) [structure e]

Question No. 6

Draw condensed structural formulae for the following compounds.

Answer :

a) phenol

b) 2-methylpentan-3-ol

Question No. 7

Draw structural formulae for the following compounds.

Answer :

a) propan-2-ol

b) butan-2,3-diol

Question No. 8

When an alkanol reacts with excess concentrated sulfuric acid: at 180 °C it undergoes an elimination reaction to form an alkene; at 140 °C it forms an ether.

Answer :

a) Using this pattern, write equations for i) 2-pentanol + H₂SO₄ at 180 °C; ii) methanol + H₂SO₄ at 140 °C

b) Name the organic products in both cases

c) What types of intermolecular forces are there between the molecules in the reactants and the products?

d) Ethanol is a liquid at room temperature and pressure. In what state would you expect the products to be? Support your answer with a reason.

Question No. 9

In the diagram of a molecule shown below, the red atoms are oxygen, black atoms are carbon and white atoms are hydrogen.

Answer :

a) Write down the molecular and structural formula of the substance represented in the diagram

b) The common name of this substance is glycerine. What is its IUPAC name?

c) Which hydrocarbon is glycerine derived from?

d) To which class of organic compounds does glycerine belong?

e) The boiling points of some compounds are given in the table: propene –42 °C; propan-1-ol –97 °C; propan-1,2-diol 187 °C; glycerine 290 °C. i) Why is there such a large increase from propene to propan-1-ol? ii) Why is there an increase from propan-1-ol to propan-1,2-diol to glycerine?

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