Please help! I can\'t figure out how to answer these. For -D-glucose, the promot

Question

Please help! I can't figure out how to answer these.

For -D-glucose, the promote solubility. A. polar hydroxyl groups; low B. nonpolar hydroxyl groups; low C. polar hydroxyl groups; high D. nonpolar hydroxyl groups; high For vitamin K1, the promote solubility A. polar aliphatic group and nonpolar aromatic group; low B. nonpolar aliphatic group and nonpolar aromatic group; lovw C. polar aliphatic group and nonpolar aromatic group; high D. nonpolar aliphatic groups and nonpolar aromatic group; high

Explanation / Answer

Consider the structure of -D-glucose as below.

-D-glucose

-D-glucose has five hydroxyl (-OH) groups. –OH groups are highly polar due to the high electronegativity difference between O and H atoms. Due to the high electronegativity difference, -OH groups can participate in hydrogen bonding with water molecules (polar themselves) and hence, glucose is highly soluble in water. Therefore, (C) is the correct answer.

Consider the structure of Vitamin K1 as below.

Vitamin K1

Vitamin K1 is an aromatic compound (contains benzene ring) with alkyl substituents. Aromatic groups and alkyl groups are highly non-polar and do not interact with water. Hence, Vitamin K1 is insoluble in water. Therefore, (B) is the correct answer.

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