COMEDK · Chemistry · 26. Alcohols Phenols and Ethers

A compound [X] undergoes reactions as given. Identify compounds [C] and [D] formed in these reactions.

A [C]: Benzoic acid [D]: Iodoform
B [C]: Benzene [D]: 2-iodo-propane
C [C]: Benzoquinone [D]: Iodoform
D [C]: 4–Iodophenol [D]: 1-iodo-propane

Verified Solution

Answer & Solution

Correct Answer

(C) [C]: Benzoquinone [D]: Iodoform

Step-by-step Solution

Detailed explanation

The given starting compound is isopropyl phenyl ether, \(Ph-O-CH(CH_3)_2\). Reaction with concentrated HI leads to the cleavage of the ether. Due to the partial double bond character of the O-phenyl bond (arising from resonance), the cleavage occurs at the O-isopropyl bond. This…

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.

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For the reaction \(2 \mathrm{~N}_{2} \mathrm{O}_{5} \longrightarrow 4 \mathrm{NO}_{2}+\mathrm{O}_{2}\), rate constant \(k\) is \(4.48 \times 10^{-5} \mathrm{~s}^{-1}\) and the initial pressure is \(600 \mathrm{~atm}\). After \(10 \mathrm{~min}\), determine the final pressure of \(\mathrm{N}_{2} \mathrm{O}_{5}\).

COMEDK 2021 Medium

Match the ions given in Column I with their characteristic properties given in Column II.

S.No.	Column I	S.No.	Column II
A	\(Cr^{2+}\)	P	Stable in aqueous medium and has magnetic moment equal to 5.92 BM.
B	\(Cu^+\)	Q	Only stable oxidation state and does not act as reducing agent.
C	\(Mn^{2+}\)	R	Is a good reducing agent due to attainment of stable \(d^3\) configuration.
D	\(Sc^{3+}\)	S	Unstable in aqueous medium and readily disproportionates.

COMEDK 2025 Medium

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