Organic Compounds - Jamb Chemistry Past Questions and Answers

Question 66:

• JAMB 1985

The I.U.P.A.C name for the compound

A. 2-methyl-3-pentene
B. 4-methyl-2-pentane
C. 2-methyl-2-pentene
D. 4-methylpent-2-ene
E. 2-methyl-3-pentane

Question 67:

• JAMB 1985

Use the following option above to answer this question. Which of the following is the functional group of carboxylic acids?

A. A
B. B
C. C
D. D
E. E

Question 68:

• JAMB 1985

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula of the compound is

A. C₈H₂₂O₃
B. C₆H₁₀O₃
C. C₁₂H₁₂O
D. C₆H₁₂O
E. C₃H₆O

Question 69:

• JAMB 1986

In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?

A. H and S;Cl
B. H and O;Cl
C. H and S;C and O
D. H and Cl;S and O

Question 70:

• JAMB 1986

Which of the following is NOT correct test for the named organic compound in each case?

A. Butanoic acid solution gives effervescence with Na₂CO₃ solution
B. Glucose when reacted with Na₂CrO₄ at 0°C will show immediate discharge of colour
C. When but-2-ene is reacted with dilute solution of KMnO₄ the purple colour of KMnO is discharged readily even room temperature
D. When butan-2-ol is boiled with butanoic acid with a drop of concentrated H₂SO₄ a sweet smelling liquid is produced