Draw the product of the following reaction. 2 HO H

1.Explanation | Common mistakes | Hint for next step

This mechanism is completed in the seven-step process. In the first step, protonation of carbonyl takes place. In the second step nucleophilic attack by the alcohol at protonated carbonyl group happens. Therefore, an intermediate is formed. In the third step, water molecule abstracts proton from intermediate to form hemiacetal. Now, in the fourth step, hydroxyl group of Hemiacetal abstracts proton from hydronium ion. Ater that in the fifth step, by the movement of lone pair of oxygen, removal of the water molecule takes place. In the sixth step, another alcohol molecule as a nucleophile attacks at the intermediate. Finally, in the seventh step, deprotonation by water molecule causes the formation of acetal as a final product.

2.

Explanation | Common mistakes

In this reaction, benzofuran reacts with BR2 to form 2,3-dibromo-2.3-dihybrobenzofuran. This is an example of the electrophilic addition reaction.

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