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Standard XII

Chemistry

Directive Influence of Substituents

Assertion :To...

Question

Assertion :Toluene in presence of UV rays forms benzaldehyde. Reason: Dichlorotoluene is formed as an intermediate.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Oxidation of toluene using $C r O_{3}$ in acetic anhydride or $C r O_{2} C l_{2}$ in $C C l_{4}$ or $C S_{2}$ and then hydrolysis gives benzaldehyde. No intermediate are formed in this reaction.

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Similar questions

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Reason:

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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

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Assertion

Lithium sulphate does not form alums.

Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst.

Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :Toluene in presence of UV rays forms benzaldehyde. Reason: Dichlorotoluene is formed as an intermediate.

The correct option is D Both Assertion and Reason are incorrectOxidation of toluene using CrO3 in acetic anhydride or CrO2Cl2 in CCl4 or CS2 and then hydrolysis gives benzaldehyde. No intermediate are formed in this reaction.

The correct option is D Both Assertion and Reason are incorrect
Oxidation of toluene using $C r O_{3}$ in acetic anhydride or $C r O_{2} C l_{2}$ in $C C l_{4}$ or $C S_{2}$ and then hydrolysis gives benzaldehyde. No intermediate are formed in this reaction.