Question

"Unmodified sugars (those with the formula C n H2 n O n ) can have ...

(a) H covalently bound to the C of a C=O group.
(b) a C atom that is covalently bound to three H atoms.
(c) the formula C3H6O3.
(d) Both (a) and (c).
(e)Both (b) and (c)."

Answer 1

Unmodified sugars with the formula CnH2nOn cannot have a carbon bonded to three hydrogen atoms, but they can have the formula C3H6O3 and cannot have hydrogen covalently bound to the carbon of a C=O group. Therefore, the correct answer is both (a) and (c).

Step-by-step explanation:

The student asked about unmodified sugars with the formula CnH2nOn. For such sugars, the correct statements from the provided options are:

1. (a) The hydrogen is not covalently bound to the carbon of a carbonyl group (C=O); instead, hydrogen is bound to carbons with single bonds.
2. (b) A carbon atom cannot be covalently bound to three hydrogen atoms as that would violate carbon's tetravalency.
3. ) The formula C3H6O3 represents a valid sugar molecule, such as a triose, which can be a monosaccharide.

Given these points, the correct answer is (d) Both (a) and (c).