Give the structures of the alcohol and the aldehyde or ketone needed to prepare each of the following.

Once an acetal or ketal is formed, either by its particular stability or by using a Dean$-$Stark apparatus, the acetal$/$ketal can be reverted back to the carbonyl compound with a slightly acidic aqueous solution $-$ a hydrolysis reaction. To predict the products of this hydrolysis, we need to recognize that the carbon with two O$-$atoms atoms attached was originally the carbonyl carbon atom.

$10.$ Draw the products for the acetal hydrolysis in aqueous acid. Just another way of asking the above question.

${?}_{H_{2}O}^{H^{+}}$