Please help with number 4. Is it a D or an L sugar? I thought when you draw the

Question

Please help with number 4. Is it a D or an L sugar? I thought when you draw the fisher projection the OH groups would be on the left, but it seems like it turns out they would be on the right? I was taught downright or upleft. The OH groups are pointing up wouldn't that mean it would be an L sugar and not a D? CH20H OH H OH CHO Compound C O Compound C is a D sugar O Compound C is an L sugar Question 4 Which one of the following statement is correct? OH HO HO Compound D O compound D is a D sugar O Compound D is an L sugar 1.4 pts

Explanation / Answer

It is L sugar.

The substitutents that are to the right in a Fischer projection formula are 'down' and those to left are 'up' in the corresponding Haworth projection formula.

The monosaccharide having the hydroxyl group at lowest chirality center pointing to the right is referred to be D-sugar.

The monosaccharide having the hydroxyl group at lowest chirality center pointing to the left is referred to be L-sugar.

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