
Interpretation:
Theory behind the three alcohols smelling differently even though they have the same functional group is to be explained.
Concept introduction:
Molecules are three dimensional. A ball and stick model helps us in knowing the exact arrangement of atoms in space. Each molecule has a different shape. Even if the molecules have same

Answer to Problem 2E
The three alcohols smell different even though they have the same functional group(-OH) because they have different three dimensional shapes. The three alcohols are geraniol, menthol and fenchol. They differ in their shapes and hence differ in smell. In geraniol, the carbon atoms are connected in long chain whereas menthol and fenchol have ring structures.
Explanation of Solution
The three alcohols have different smell because their overall shapes are different. The ball and stick model tells us about the overall shape of the molecule. Molecules with same functional groups, such as geraniol C10H18O, menthol C10H20O and fencholC10H18O differ in their overall shapes. Hence they differ in smell. In geraniol, the carbon atoms are connected in long chain whereas menthol and fenchol have ring structures.
The structural formula of a molecule shows the molecule flat with the carbon atoms arranged in line whereas the ball and stick model shows the three dimensional structure of the molecule. This helps in better understanding the shape of the molecule. Differently shaped molecules have different smell even if they have the same functional groups.
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