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In the following questions, a statement ...

In the following questions, a statement of assertion (A) is followed by a statement of reason (R )
A : Both methane and tetrachloromethane are nonpolar.
R : C-Cl bond is polar bond.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements , then mark (4).

Text Solution

AI Generated Solution

The correct Answer is:
To solve the given question, we need to analyze the assertion (A) and the reason (R) provided: **Assertion (A):** Both methane and tetrachloromethane are nonpolar. **Reason (R):** C-Cl bond is a polar bond. ### Step-by-Step Solution: 1. **Understanding Methane (CH₄):** - Methane consists of one carbon atom bonded to four hydrogen atoms. - The electronegativity difference between carbon (C) and hydrogen (H) is small, leading to a nonpolar C-H bond. - The symmetrical tetrahedral shape of methane means that the dipole moments of the C-H bonds cancel each other out, resulting in a net dipole moment of zero. - Therefore, methane is a nonpolar molecule. 2. **Understanding Tetrachloromethane (CCl₄):** - Tetrachloromethane consists of one carbon atom bonded to four chlorine atoms. - The C-Cl bond is indeed polar due to the significant electronegativity difference between carbon and chlorine. - However, similar to methane, tetrachloromethane has a symmetrical tetrahedral shape, which means that the dipole moments of the four C-Cl bonds also cancel each other out. - As a result, tetrachloromethane also has a net dipole moment of zero, making it a nonpolar molecule. 3. **Evaluating the Assertion and Reason:** - The assertion that both methane and tetrachloromethane are nonpolar is true. - The reason states that the C-Cl bond is polar, which is also true. - However, the reason does not correctly explain why tetrachloromethane is nonpolar. It only states that the C-Cl bond is polar without addressing the overall molecular symmetry that leads to the cancellation of dipole moments. 4. **Conclusion:** - Both the assertion and reason are true, but the reason does not provide the correct explanation for the assertion. - Therefore, the correct option is: **Both are true, but the reason is not giving the correct explanation.** ### Final Answer: The correct option is 2: Both are true, but the reason is not giving the correct explanation. ---
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