WAEC Chemistry Past Questions & Answers - Page 272

1,356.

An organic compound which reacts readily with bromine to form a compound with the formula CH3CHBrCH2Br is

A.

ethene

B.

propane

C.

butane

D.

propene

E.

propyne

Correct answer is D

X + \(Br_2\) → \(CH_3CHBrCH_2Br\)

The compound must be propene because it is unsaturated and does react with bromine water to form 1,2, - dibromo- propane, unlike propyne, which will give a different product.

1,357.

When a crystal was added to its solution, it did not dissolve and the solution remained unchanged, showing that the solution was

A.

concentrated

B.

supersaturated

C.

unsaturated

D.

colloidal

E.

saturated

Correct answer is E

No explanation has been provided for this answer.

1,359.

In which of the following crystals are the particles held by van der Waal's forces only?

A.

Sodium chloride

B.

Ice

C.

Diamond

D.

Iodine

E.

Quartz

Correct answer is D

No explanation has been provided for this answer.

1,360.

Compounds that have the same molecular formula but different structures are said to be

A.

allotropic

B.

polymorphic

C.

polymeric

D.

isomeric

E.

isotopic

Correct answer is D

No explanation has been provided for this answer.