WAEC Past Questions and Answers - Page 1470

7,347.

A hydrocarbon containing 88.9% carbon has the empirical formula [H = 1 C = 12]

A.

CH

B.

CH2

C.

C2H3

D.

C2H5

Correct answer is B

No explanation has been provided for this answer.

7,348.

Arrange the following compounds in order of increasing boiling point
l.CH 3CH2CH2OH
II.CH 3CH 2OH
III.CH3CH2CH2CH2OH
IV. CH3CH 2CH2CH 2CH 3

A.

I < II < IV < III

B.

IV < III < II < I

C.

I < II < III < IV

D.

IV < I < II< III

Correct answer is D

Ethanol 78°C
Propanol 97°C
Butanol 118°C
Pentane 36.1°C

Hence, the arrangement is IV, I, II, III. 

7,349.

What is the main type of reaction alkenes undergo?

A.

Addition

B.

Condensation

C.

Elimination

D.

Substitution

Correct answer is A

No explanation has been provided for this answer.

7,350.

The hydrolysis of groundnut oil by potassium hydroxide is known as

A.

hydrogenation

B.

saponification

C.

esteriffication

D.

neutralization

Correct answer is B

No explanation has been provided for this answer.