Final answer:
An c) acyl phosphate is a specific type of organic ester that is formed by bonding a carboxylic acid and a phosphoric acid group, thus the correct identification for mixed anhydride or acyl phosphate is 'Acyl phosphate'.
Step-by-step explanation:
Understanding Acyl Phosphates
Mixed anhydrides or c) acyl phosphates are molecules formed by the bonding between a carboxylic acid and phosphoric acid.
They are essentially a category of organic phosphoric acid esters.
An acyl phosphate typically consists of the carbonyl carbon from the carboxylic acid component bonded to the oxygen of a phosphate group.
Hence, the acyl phosphate is neither an ester of only carboxylic acid nor phosphoric acid alone; it is a specific type of ester, known as an acyl phosphate ester.
In contrast, an ester in traditional sense is usually a carboxylic acid where the -OH has been replaced by an -OR (alkoxy) group, an amide involves the replacement of the -OH with an -NR₂ group, and a ketone is characterized by a carbonyl group between two alkyl or aryl groups.
Given the molecular structure of acyl phosphates, when answering the question 'Mixed anhydride or acyl phosphate (carboxylic acid and phosphoric acid) is an example of what type of compound?', the correct option is c) Acyl phosphate.