(a)
Interpretation:
The compounds
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.
Example:
Ionic substances contain ions. Covalent substances have covalent bonds that are formed by mutual sharing of electrons. Ionic substances are made of up of many positive and negative ions that constitute a three-dimensional crystal. Due to this three-dimensional crystal, ionic substances have higher melting and boiling points than covalent substances.
(b)
Interpretation:
The compounds
Concept Introduction:
Refer part (a).

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Chapter 10 Solutions
GENERAL,ORGANIC,+BIOCHEMISTRY
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