Statement I: Cyclic acetal formation of glycols by glycose confirms the presence of a hydroxyl group
Statement II: Carbonyl compounds generally form acetals with alcohols
Answer & explanation
Correct answer: option 4
Statement I: Cyclic acetal formation of glycols by glycose confirms the presence of a hydroxyl group
Statement I is false. Cyclic acetal formation of glycols by glycose does not necessarily confirm the presence of a hydroxyl group. While glycols do have hydroxyl groups, the formation of cyclic acetals does not solely indicate the presence of a hydroxyl group. Cyclic acetals can be formed through the reaction of a carbonyl compound (aldehyde or ketone) with an alcohol, and the presence of a hydroxyl group is not a prerequisite for the formation of a cyclic acetal.
Statement II: Carbonyl compounds generally form acetals with alcohols
Statement II is correct. Carbonyl compounds, which include aldehydes and ketones, can indeed form acetals with alcohols. Acetals are formed when a carbonyl group reacts with one or more alcohol groups in the presence of an acid catalyst. This reaction is a well-known method for the protection of carbonyl groups in organic synthesis.
Therefore, the correct answer is (4) Statement I is false, but Statement II is correct.