A hydroxy compound 
with molar mass 
is acetylated with acetic anhydride, using a large excess of the reagent ensuring complete acetylation of all hydroxyl groups. The product obtained has a molar mass of 
. The number of hydroxyl groups present in compound (X) is:
Text Solution
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In acetylation, each hydroxyl group reacts:
.
Each -OH is converted to 
, resulting in a net mass increase of 
per hydroxyl group (addition of acetyl group mass 43, removal of hydrogen mass 1).
Given: Original molar mass 
, Product molar mass 
Total mass increase 
Number of hydroxyl groups 
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