Identify intermediate A, which has a molecular formula of C10H16O2, and give a curved-arrow mechanism for the transformation of A to the final product. Details count! Show ALL lone pairs of electrons and formal charges. Once you have supplied the organic intermediate A, do not add or remove atoms for the rest of the steps (i. e., atom conservation). If a CHx group is being deprotonated, draw all H\'s on the reacting site.

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Explanation:

The mechanism (which is a reaction mechanism can be described as a sequence of elementary reactions in a step by step mode by which overall chemical change takes place. A chemical mechanism is a hypothetical and theoretical assumption that tries to illustrate in detail what occurs at each stage of a total chemical reaction.) of the above problem can be seen in the attached image below :

the answer is 0.42 is that is an option. this question provides no info