The increasing order of boiling points of the following compounds is:

I. 4-methylphenol (p-cresol)
II. 4-nitrophenol
III. 4-aminophenol
IV. 4-methoxyphenol

Question

The increasing order of boiling points of the following compounds is:

I. 4-methylphenol (p-cresol)
II. 4-nitrophenol
III. 4-aminophenol
IV. 4-methoxyphenol

Canvas Classes · Accepted Answer

Step 1 — Factors affecting boiling point:
Higher boiling point = stronger intermolecular forces (H-bonding, dipole–dipole, molecular weight).

Step 2 — Analyse each compound:

I. 4-methylphenol (p-cresol): Has –OH (H-bonding), methyl group (weak electron donor). Moderate bp.

II. 4-nitrophenol: Has –OH (H-bonding) + –NO₂ (strong electron withdrawor, increases polarity). High bp due to strong dipole and H-bonding.

III. 4-aminophenol: Has –OH AND –NH₂ (two H-bond donors + acceptors). Very extensi

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