COMEDK · Chemistry · 26. Alcohols Phenols and Ethers

By heating phenol, with chloroform in alkali, it is converted into

A salicylic acid
B salicylaldehyde
C anisole
D phenyl benzoate

Verified Solution

Answer & Solution

Correct Answer

(B) salicylaldehyde

Step-by-step Solution

Detailed explanation

Phenol on heating with chloroform in alkali get converted into salicylaldehyde. This reaction is called Reimer-Tiemann reaction.

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 the compounds given in column I with the corresponding most stable Carbocations formed by each, as given in Column II, when they undergo acidic dehydration in presence of Conc. \(\mathrm{H}_2 \mathrm{SO}_4\).

No.	Column I	No.	Column II
A	2-Methylbutan-1-ol	P	\((CH_3)_2\overset{+}{C} - CH(CH_3)_2\)
B	Butan-2-ol	Q	\(CH_3 - CH_2 - CH_2 - \overset{+}{C}H_2\)
C	3,3-Dimethylbutan-2-ol	R	\((CH_3)_2\overset{+}{C} - CH_2 - CH_3\)
D	Butan-1-ol	S	\(CH_3 - \overset{+}{C}H - CH_2 - CH_3\)

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