Among the following four aromatic compounds, which one will have the lowest melting point ?
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The Correct Option is B
Solution and Explanation
Option (2) naphthalene: non-polar, only weak London forces, m.p. about 80 C.
Option (3) phthalic acid: two COOH groups, strong hydrogen bonding, m.p. about 207 C.
Option (4) 2,3-diacetylnaphthalene: polar, higher molar mass, stronger dipole interactions, higher m.p. than naphthalene.
Lowest melting point: naphthalene, option (2).
Answer: (2) naphthalene
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