Question

Assertion:Carbon tetraiodide, $(C{I_4})$ is a solid, whereas carbon tetrafluoride,$(C{F_4})$ is a gas.
Reason:This is due to the London dispersion to dipole-dipole interaction because of the increased polarity.
A.Both assertion and reason are correct and the reason is the correct explanation of assertion.
B.Both assertion and reason are correct but the reason is not the correct explanation of assertion.
C.Assertion is correct but reason is incorrect.
D.Both assertion and reason are incorrect.

Answer 1

We have to know that the London dispersion force is always seen between two polar molecules and the force is acting between these two molecules which is normally electrically symmetric. The London dispersion force is the weakest force which clings the molecules together. And the dipole-dipole interaction is the interaction between two polar molecules and it is an electrostatic interaction.

Complete answer:
As we know that both carbon tetraiodide and carbon tetrafluoride is a tetra halomethane. Here, the carbon and halogen forms a covalent compound. The Carbon tetraiodide, $(C{I_4})$ is a solid, but carbon tetrafluoride,$(C{F_4})$ is a gas. There is an increasing polarity due to increasing the strength from London dispersion force to dipole-dipole interaction. Therefore, in the given statements, both assertion and reason is correct and reason is the correct explanation of assertion.
Hence, option (A) is correct.
The physical properties of both carbon tetraiodide and carbon tetrafluoride depend on polarity and strength of London dispersion force and dipole-dipole interaction. Therefore, the reason is the correct explanation of assertion.
Hence, the option (B) is incorrect.
The reason is a correct statement. Because, the polarity and strength of London dispersion force and dipole-dipole interaction is the main reason for the physical states of carbon tetraiodide and carbon tetrafluoride. Hence, the option (C) is incorrect.
Both reason and assertion are correct statements. Hence, the option (D) is incorrect.

Note:
In the given statement, both assertion and reason is correct and reason is the correct explanation of assertion. Which means, the Carbon tetraiodide, $(C{I_4})$ is a solid, but carbon tetrafluoride,$(C{F_4})$ is a gas and it is due to the increasing strength of London dispersion to dipole-dipole interaction and increasing the polarity. In dipole-dipole interaction, there is an interaction between the negative ends of one molecule with the positive end of another molecule.