Organic Compounds - Jamb Chemistry Past Questions and Answers

Question 51:

• JAMB 1984

An organic compound with a vapour density 56.5 has the following percentage composition:C =53.1% N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is
Relative atomic masses: N = 14, O = 16, C = 12, H = 1 )

A. C₃H₆O₂N
B. C₅H₆O₂N
C. (C₅H₇O₂N)_1/2
D. C₅H₇O₂N
E. (C₅H₇O₂N)₂

Question 52:

• JAMB 1984

Alkaline hydrolysis of naturally occurring fats and oils yields

A. Fats and acids
B. Soaps and glycerol
C. Margarine and butter
D. Esters
E. Detergents

Question 53:

• JAMB 1984

Alkanes

A. Are all gases
B. Have the general formula C_nH_2n + ₂O
C. Contain only carbon and hydrogen
D. Are usually soluble in water
E. Are usually active compounds

Question 54:

• JAMB 1984

If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bring sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone

A. A polymerization reaction
B. An isomerization reaction
C. An addition reaction
D. A substitution reaction
E. A reduction reaction

Question 55:

• JAMB 1984

The function of conc. H₂SO₄ in the esterification of ethanoic acid with ethanol is to

A. Serve as a dehydrating agent
B. Serve as a solvent
C. Act as a catalyst
D. Prevent any side reaction
E. Serve as an oxidizing agent