JAMB Past Questions and Answers - Page 1546

7,726.

2 - methyl propan -2- ol is an example of a

A.

primary alkanol

B.

secondary alkanol

C.

tertiary alkanol

D.

quartenary alkanol

Correct answer is C

No explanation has been provided for this answer.

7,727.

The saponification of an alkanoate to produce soap and alkanol involves

A.

dehydration

B.

esterification

C.

hydrolysis

D.

oxidation

Correct answer is C

No explanation has been provided for this answer.

7,728.

A compound contains 40.0% C, 6.7% H 53.3% O. If the molecular mass of the compound is 180, its molecular formula is [C =12, H =1,O]

A.

CH2O

B.

C3H6O3

C.

C6H6O3

D.

C6H12O6

Correct answer is D

No explanation has been provided for this answer.

7,729.

Carbohydrates are large molecules with the molecular formula C\(_x\)(H\(_2\)O)\(_y\). In which of the following pairs is x not equal to y?

A.

glucose and starch

B.

maltose and starch

C.

sucrose and fructose

D.

galactose and starch

Correct answer is B

Glucose = C\(_6\)(H\(_2\)O)\(_6\)

= C\(_6\)H\(_{12}\)O\(_6\)

Maltose = C\(_{12}\) (H\(_2\)O)\(_{11}\)

= C\(_{12}\)H\(_{22}\)O\(_{11}\)

Starch = C\(_6\) (H\(_2\)O)\(_5\)

= C\(_6\)H\(_{10}\)O\(_5\)

Sucrose = C\(_{12}\) (H\(_2\)O)\(_{11}\)

= C\(_{12}\)H\(_{22}\)O\(_{11}\)

Fructose = C\(_6\)(H\(_2\)O)\(_6\)

= C\(_6\)H\(_{12}\)O\(_6\)

 

7,730.

The isomers of C3H8O ARE

A.

1 - propanol and 2 - propanol

B.

1 - propanol and 1 - propanol

C.

2 - propanol and 2 - propanone

D.

2 - propanol and 1 - propanol

Correct answer is A

No explanation has been provided for this answer.