MHT CET · Chemistry · General Organic Chemistry

Which among the following is NOT a pair of isomers?

A Butan-2-ol and 2-Methylpropanol
B Butan-1-ol and 1-Methoxypropane
C 1-Methoxypropane and Ethoxyethane
D Methoxyethane and Ethoxyethane

Verified Solution

Answer & Solution

Correct Answer

(D) Methoxyethane and Ethoxyethane

Step-by-step Solution

Detailed explanation

Isomers have same molecular formula but different arrangement of atoms.
\(\mathrm{H}_3 \mathrm{C}-\mathrm{O}-\mathrm{CH}_2-\mathrm{CH}_3\)
Methoxyethane
\(\left(\mathrm{C}_3 \mathrm{H}_8 \mathrm{O}\right)\)
\(\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{O}-\mathrm{CH}_2-\mathrm{CH}_3\)
Ethoxyethane
\(\left(\mathrm{C}_4 \mathrm{H}_{10} \mathrm{O}\right)\)
Methoxyethane and Ethoxyethane have different molecular formulae and hence, they are not isomers.

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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