mistake with destroyer

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Actually it's not wrong.

The generic form of an Acetal used to be considered as you mentioned or as displayed below:
Generic_Acetal.png


But many have interpreted today that an Acetal can be considered a Carbon bonded with 2-OR groups and 2-R groups. Which in fact is a Ketal as shown below:
Generic_Ketal.png


But todays terminology in Organic Chemistry all ketals are classified under a subset of Acetals. So in fact the answer is correct. It's a trick question but nothing wrong with it.
 
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