Question 506:

• JAMB 1987

Inspite of the electronic configuration, 1s²2s²2p², carbon is tetraavalent because?

A. The electrons in both 2s and 2p orbitals have equal energy
B. The electrons in both 2s and 2p orbitals are equivalent
C. Both the 2s and 2p orbitals hybridizes
D. The six orbitals hybridize to four

Question 507:

• 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 508:

• 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 509:

• 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 510:

• 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