Organic Compounds - Jamb Chemistry Past Questions and Answers

Question 151:

• JAMB 1997

Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR.The section OP suggests that X is in the

A. Liquid sate
B. Solid/liquid state
C. Solid state
D. Gaseous state

Question 152:

• JAMB 1997

The IUPAC nomenclature of the organic compound with the above structural formula is

A. 3-ethyl-2,5-dimethylhexane
B. 4-ethyl-2,5-dimethylhexane
C. 3-ethyl-2,5,5 - trimethylpentane
D. 3-ethyl, 1,1,4-trimethylpentane

Question 153:

• JAMB 1997

How many more isomers of the compound above can be obtained ?

A. 5
B. 4
C. 3
D. 2

Question 154:

• JAMB 1997

Choose the correct answer from the options above. When Fehling is solution is added to two isomeric carbonyl compounds X and Y with the molecular formula C ₅H ₁₀O, compound X gives a red precipitate while Y does not react. It can be inferred that X is

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

Question 155:

• JAMB 1997

The compound above contains

A. Sp ³ hybridized carbon atoms only
B. Sp ² hybridized carbon atoms only
C. Sp ³ and Sp hybirdized carbon atoms
D. Sp ³ and Sp ²hybridized carbon atoms>