JEE Mains · Chemistry · STD 12 - 7. Alcohol, phenol and ethers

The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to.

A Hyperconjugation in substrate
B Polarity of solvent
C Free radical formation
D Electromeric effect of the substrate

Verified Solution

Answer & Solution

Correct Answer

(B) Polarity of solvent

Step-by-step Solution

Detailed explanation

Difference in reactions is observed due to solvent polarity, which \((i)\) Ionizes phenol to make more reactive phenoxide ion \((ii)\) Increases electrophilicity of bromine.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List \(I\) with List \(II\).

List \(I\)	List \(II\)
\(A\) van't Hoff factor, \(i\)	\(I\) Cryoscopic constant
\(B\) \(k _{ f }\)	\(II\) Isotonic solutions
\(C\) Solutions with same osmotic pressure	\(III\) \(\frac{Normal\,molar\,mass}{Abnormal\,molar\,mass}\)
\(D\) Azeotropes	\(IV\) Solutions with same composition of vapour above it

Choose the correct answer from the options given below :

JEE Mains 2023 Medium

Which one of the following correctly represents the order of stability of oxides, \(\mathrm{X}_{2} \mathrm{O} ;(\mathrm{X}=\) halogen \() ?\)

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