Multiple Choice
Which of the following functional groups is responsible for the color of pigments in organic compounds?
2. Molecular Representations
Functional Groups
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In the context of functional groups, which of the following best describes the terms 'hydrophobic' and 'hydrophilic'?
A
Hydrophobic and hydrophilic both refer to groups that dissolve easily in water.
B
Hydrophobic refers to water-attracting groups, while hydrophilic refers to water-repelling groups.
C
Hydrophobic and hydrophilic both refer to groups that repel water.
D
Hydrophobic refers to water-repelling groups, while hydrophilic refers to water-attracting groups.
Verified step by step guidance1
Understand the definitions of hydrophobic and hydrophilic: Hydrophobic groups are those that repel water, while hydrophilic groups are those that attract or interact favorably with water.
Consider the nature of chemical interactions: Hydrophobic groups typically consist of nonpolar molecules that do not form hydrogen bonds with water, whereas hydrophilic groups are often polar or charged, allowing them to form hydrogen bonds or ionic interactions with water.
Identify examples of hydrophobic and hydrophilic groups: Common hydrophobic groups include alkyl chains, such as those found in hydrocarbons, while hydrophilic groups include hydroxyl (-OH), carboxyl (-COOH), and amino (-NH2) groups.
Analyze the implications for solubility: Hydrophilic groups tend to dissolve easily in water due to their ability to interact with water molecules, whereas hydrophobic groups do not dissolve well in water and may aggregate to minimize contact with water.
Apply this understanding to the problem statement: Recognize that the correct description is that hydrophobic refers to water-repelling groups, while hydrophilic refers to water-attracting groups, aligning with the definitions and examples provided.
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