41. Which pair of compounds could combine to produce an ester? I. CH3- CH2 - CH2 - CH3

II. CH3- CH2 - CH2-CH2-OH

III. CH3- CH2 - CH2-COOH

IV. CH3- CH2- CH2- COH

a. I and II
b. II and III
c. II and IV
d. III and IV

b. ii and iii

Explanation:

The ester, Butyl Butanoate is formed when Butanol reacts with Butanoic acid

as seen below;

CH3-CH2-CH2-CH2-OH  +  CH3-CH2-CH2-COOH     >

Butanol                                     Butanoic acid

CH3-CH2-CH2-COOCH2-CH2-CH2-CH3   +          H2O

Butyl Butanoate                                                      Water

the correct answer is:

a. formation of precipitation