'A' on reaction with excess of acyl chloride produces 'B', which is having $126$ g more molar weight as compared to 'A'. Then the possible structure of 'A' is:

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Solution

The correct option is A
DBU of A is zero which means all the oxygens are connected with single bond. The molecule may be alcohol or ether. Since it is reacting with acyl chloride which indicates the presence of replaceable hydrogen.
Increase in mass of B by 126 g/mol indicate the acylation of three hydroxy groups.

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'A' on reaction with excess of acyl chloride produces 'B', which is having 126 g more molar weight as compared to 'A'. Then the possible structure of 'A' is:

'A' on reaction with excess of acyl chloride produces 'B', which is having $126$ g more molar weight as compared to 'A'. Then the possible structure of 'A' is: