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CBSE Class 12 · 2003 · Foreign · Aldehydes Ketones and Carboxylic AcidsShort Answer

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Write the IUPAC names of the two compounds shown in the figure (an unsaturated dicarboxylic skeleton and a polysubstituted benzoic acid).
Structure (i)
(i)
Structure (ii)
(ii)

Solution

(i) The displayed chain holds two –COOH ends and a C=C: name it as the alk-ene-dioic acid (both carboxyls take locants 1 and n; the methyl and double bond get their chain positions).
(ii) The displayed ring is a benzoic acid: C-1 is the –COOH carbon; number the ring to give the lowest locants to Br, OH and NO and cite them alphabetically (bromo-, hydroxy-, nitro-benzoic acid with those locants).
Read exact positions from the figure.

CBSE Class 12 Board · 2003 · Foreign · Subjective

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