Organic Compounds - Jamb Chemistry Past Questions and Answers

Question 21:

• JAMB 1979

Methanoic acid mixes with water in all proportions and has about the same boiling point as water which of the following methods would you adopt to obtain pure water from a mixture of stand, water and methanoic acid?

A. Fractional distillation
B. Filtration followed by distillation
C. Neutralization with sodium hydroxide followed by distillation
D. Esterification with ethanol followed by distillation
E. Neutralization with sodium hydroxide followed by filtration

Question 22:

• JAMB 1979

Hydrogenation may be effected by

A. The removal of hydrogen from an alkane in the presence of a catalyst
B. The addition of hydrogen to an alkane in the presence of a catalyst
C. The addition of hydrogen to an alkyne
D. The removal of hydrogen from an alkyne
E. The addition of hydrogen to an ethyl alcohol

Question 23:

• JAMB 1979

When excess ethanol is heated to 145 ^oC in the presence of concentrated sulphuric acid, the product is

A. Diethyl ether
B. Ethyne
C. Diethyl sulphate
D. Acetone
E. Ethanoic acid

Question 24:

• JAMB 1979

The IUPAC name for

A. 2-methylbut-3-ene
B. 2-methylbut-4-ene
C. 3-methylbut-2-ene
D. 3-methylbut-1-ene
E. 3-methylpent-1-ene

Question 25:

• JAMB 1980

Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst?

A. Ethyl ethanoate
B. Methyl ethanoate
C. Ethyl methyl ketone
D. Butanol
E. None