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Standard XII

Chemistry

IUPAC System of Nomenclature

Assertion :Th...

Question

Assertion :The molar mass obtained for benzoic acid in benzene is found to be nearly 244. Reason: Benzoic acid has the molecular formula $C_{6} H_{6} O_{2}$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Assertion is correct. In benzene, the benzoic acid forms dimer. Hence, the observed molecular weight is twice the actual molecular weight $(2 \times 122 = 244)$ .
Reason is incorrect. The actual molecular formula of benzoic acid is $C_{7} H_{6} O_{2}$

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Q. Assertion: The compressibility factor for

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Reason: The compressibility factor for

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Assertion: Be and Al have similar properties.

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Reason (R) Lewis acid polarises the bromine molecule.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :The molar mass obtained for benzoic acid in benzene is found to be nearly 244. Reason: Benzoic acid has the molecular formula C6H6O2

The correct option is C Assertion is correct but Reason is incorrectAssertion is correct. In benzene, the benzoic acid forms dimer. Hence, the observed molecular weight is twice the actual molecular weight(2×122=244).Reason is incorrect. The actual molecular formula of benzoic acid is C7H6O2

Assertion :The molar mass obtained for benzoic acid in benzene is found to be nearly 244. Reason: Benzoic acid has the molecular formula $C_{6} H_{6} O_{2}$