COMEDK · Chemistry · 13. General Organic Chemistry

Which of the following is an INCORRECT statement?

A \(\text{CH}_3\text{OH}\) and \(\text{CH}_3\text{COCH}_3\) are separated by fractional distillation
B In sodium nitroprusside test for Sulphur, the violet colour is due to formation of complex \(\text{Na}_4[\text{Fe(CN)}_5\text{NOS}]\)
C \(\text{AlCl}_3, \text{NH}_3, \text{SO}_3, \text{NO}_2^+, \text{H}_2\text{O}\) are electrophiles
D \(\text{CH}_3\text{COO}^-, \text{CN}^-, \text{CH}_3\text{OH}, \text{CH}_3-\text{O}-\text{CH}_3, (\text{CH}_3)_3\text{N}\) are nucleophiles

Verified Solution

Answer & Solution

Correct Answer

(C) \(\text{AlCl}_3, \text{NH}_3, \text{SO}_3, \text{NO}_2^+, \text{H}_2\text{O}\) are electrophiles

Step-by-step Solution

Detailed explanation

Electrophiles are electron-deficient species that can accept an electron pair. While \(\text{AlCl}_3\), \(\text{SO}_3\), and \(\text{NO}_2^+\) are electrophiles, \(\text{NH}_3\) and \(\text{H}_2\text{O}\) possess lone pairs of electrons on their central atoms (nitrogen and…

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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