JAMB Chemistry Past Questions & Answers - Page 144

716.

USE THE DIAGRAM ABOVE TO ANSWER THIS QUESTION. Which of the following represents a carboxylic acid?

A.

A

B.

B

C.

C

D.

D

E.

E

Correct answer is A

A carboxylic acid is an organic acid that contains a carboxyl group attached to an R-group. The general formula of a carboxylic acid is R−COOH or R−CO₂H, with R referring to the alkyl, alkenyl, aryl, or other group.

717.

The name of the compound above is

A.

acetic acid

B.

propanal

C.

propanol

D.

ethanoic acid

E.

propanoic acid

Correct answer is E

the compound is propanoic acid, it contains the carboxyl group COOH.

718.

The diagram above (Fig.3) shows the energy profile for the reaction A + B + = C + D From this diagram, it is clear that the reaction is

A.

spontaneous

B.

isothermal

C.

adiabatic

D.

exothermic

E.

endothermic

Correct answer is D

No explanation has been provided for this answer.