WAEC Chemistry Past Questions & Answers - Page 151

751.

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.

752.

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.

753.

When ethanol is heated with excess concentrated tetraoxosulphate (VI) acid, the organic product formed is

A.

ethanal

B.

ethanoic acid

C.

ethane

D.

ethene

Correct answer is D

No explanation has been provided for this answer.

754.

Which of the following compounds would not give a precipitate with ammoniacal AgNO3 solution?

A.

CH3 C≡CCH3

B.

HC≡CH

C.

CH3C≡CH

D.

CH3CH2C≡CH

Correct answer is A

 Only terminal alkyne(simply, the alkyne in which the triple bonded carbon atoms are at the extreme positions.) reacts with ammonical AgNO3 and gives a white precipitate,

therefore, the correct option is A  (Non-Terminal Alkyne has a triple bond at any place other than the end positions).

755.

A mixture of kerosene and diesel oil can be separated by

A.

crystallization

B.

distillation

C.

precipitation

D.

sublimation

Correct answer is B

No explanation has been provided for this answer.