Organic Compounds - Jamb Chemistry Past Questions and Answers

Question 76:

• JAMB 1986

Use the options above to answer this question. Which is the structural formula for pent-2-enoic acid?

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

Question 77:

• JAMB 1987

Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?

A. CH₃ = CHCH₃
B. CH₃ ≡ CCH₃
C. HC = C-CH₂CH₃
D. CH₂ = CH-CH = CH₂

Question 78:

• JAMB 1987

The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?

A. Branched chain alkanes
B. Straight chain alkanes
C. Cycloalkanes
D. Halogenated hydrocarbons

Question 79:

• JAMB 1987

Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?

A. Trichloromethane
B. Triodomethane
C. Iodoethane
D. Ethanal

Question 80:

• JAMB 1987

The most volatile fraction obtained from fractional distillation of crude petroleum contains?

A. Butane , propane and kerosene
B. Butane , propane and petrol
C. Ethane, methane and benzene
D. Methane, ethane and propane