Organic Compounds - Jamb Chemistry Past Questions and Answers

Question 46:

• JAMB 1983

Which of the following separation processes is most likely to yield high quality ethanol (>95%) from palm wine?

A. Fractional distillation without a dehydrant
B. Simple distillation with a dehydrant
C. Fractional distillation with a dehydrant
D. Column chromatography
E. Evaporation

Question 47:

• JAMB 1983

A jet plane carrying 3,000 kg of ethane burns off all the gas forming water and carbondioxide. if all the carbondioxide is expelled and all the water formed is condensed and kept on board the plane, then the gain in weight is

A. 1,800 kg
B. 900 kg
C. 600 kg
D. 2, 400 kg
E. 1, 200 kg

Question 48:

• JAMB 1984

An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit.

A. Polymerism
B. Isotopy
C. Isomorphism
D. Isomerism
E. Allotrophy

Question 49:

• JAMB 1984

The hybridization of the carbon atom in ethyne is

A. Sp ⁴
B. Sp ³
C. Sp²
D. Sp
E. S

Question 50:

• 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