number 174.... not an acetal cause an acteal would have a H on carbon at it shows one bonded to two -OR groups and 2 -R groups.. so a mistake

Actually it's not wrong.

The generic form of an Acetal used to be considered as you mentioned or as displayed below:
http://upload.wikimedia.org/wikipedia/commons/5/53/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:
http://upload.wikimedia.org/wikipedia/commons/7/79/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.