(a)
Interpretation:
Given molecules has to be arranged from highest to lowest melting points.
Concept Introduction:
The force of attraction between two molecules that experience a short-lived dipole is known as London Dispersion force. Large molecules will have large number of electrons. These electrons when in constant motion develop a temporary dipole. The formed temporary dipole interacts with other temporary dipoles resulting in an attractive force between the molecules. Molecules with a very high molar mass have large number of electrons. This result in having stronger force of attraction and due to this the melting point and boiling point of the molecule will be higher.
(b)
Interpretation:
Given molecules has to be arranged from highest to lowest melting points.
Concept Introduction:
Refer part (a).

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Chapter 11 Solutions
GENERAL,ORGANIC,+BIOCHEMISTRY(LL)-PKG
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