Organic Compounds - Jamb Chemistry Past Questions and Answers

Question 61:

• JAMB 1985

An organic compound decolourized acidified KMnO₄ solution but failed to react with ammoniacal silver nitrate solution. The organic compound is likely to be?

A. A carbonxylic acid
B. An alkane
C. An alkene
D. An alkyne
E. An akanone

Question 62:

• JAMB 1985

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Compound X is?

A. An alkene
B. An alkane
C. An alkyne
D. Tetrachloromethane
E. Dichloromethane

Question 63:

• JAMB 1985

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Y and Z are respectively?

A. CO₂ and NH₃
B. CO and NH₃
C. SO₂ and H₂O
D. CO₂ and H₂O
E. SO₂ and NH₃

Question 64:

• JAMB 1985

The process involved in the conversion of an oil into margarine is known as?

A. Hydrogenation
B. Condensation
C. Pyrolysis
D. Dehydration
E. Cracking

Question 65:

• JAMB 1985

Which of the following roles does sodium chloride play in soap preparation? It

A. Reacts with glycerol
B. Purifies the soap
C. Accelerates the decomposition of the fat or oil
D. Separates the soap from the glycerol
E. Converts the fatty acid to its sodium salt