Decarboxylation of all six possible forms of diaminobenzoic acids C 6 H 3 NH 2 2 COOH yields three products…

Decarboxylation of all six possible forms of diaminobenzoic acids C6H3NH22COOH yields three products A,B and C. Three acids give a product 'A', two acids gives a product 'B' and one acid give a product 'C'. The melting point of product 'C' is
  1. 63 °C
  2. 90 °C
  3. 104 °C
  4. 142 °C

Solution

C is a para isomer.

The melting point of para-isomer is comparatively higher than the corresponding  ortho and meta-isomers , because of more symmetrical nature; it fits into crystal lattice more readily and so, close packing of molecules in crystal lattice increases the intermolecular force of attraction between molecules.

Hence C has highest melting point that is 142 °C

Asked in: JEE Main 2022 (27 Jun Shift 2)

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