Chapter 20.12, Problem 25P

Interpretation Introduction

Interpretation:

The products (in chair conformers formed), from the reaction of $\beta \text{-}$ D-galactose with ethanol and $\text{HCl}$ have to be drawn.

Concept Introduction:

Sugar molecule in which hydroxyl groups of first and sixth carbon atom are on the same side is known as $\alpha$ sugar, otherwise, $\beta$ sugar.  Hydroxyl group of $\alpha$-sugar present on right side in Fischer projection is represented down in Haworth projection and at axial position in chair conformation.