WAEC Chemistry Past Questions & Answers - Page 81

401.

Which of the following compounds is/are secondary alkanols?

i) CH3CH(CH3)CH3OH
ii) CH3CH2CH(OH)CH3
iii) CH3C(OH)(CH3)CH3

A.

I only

B.

II only

C.

I and III only

D.

II and III only

Correct answer is B

No explanation has been provided for this answer.

402.

The compound that makes palm wine taste sour after exposure to the air for few days is

A.

Ethanol

B.

Ethanoic acid

C.

Methanol

D.

Methanoic acid

Correct answer is A

The ethanol (alcohol content) of the wine, is oxidized, by the oxygen in the air into ethanoic acid.

403.

Ripening of fruits is hastened by using

A.

Ethanol

B.

Ethane

C.

Ethene

D.

Ethyne

Correct answer is C

No explanation has been provided for this answer.

404.

When a compound X is heated with concentrated tetraoxosulphate(VI)acid, it produces an alkene. X ia an

A.

Alkane

B.

Alkanol

C.

Alkanoate

D.

Alkyne

Correct answer is B

No explanation has been provided for this answer.

405.

Amino acids are obtained from proteins by

A.

Hydrolysis

B.

Oxidation

C.

Polymerization

D.

Reduction

Correct answer is A

No explanation has been provided for this answer.