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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