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If the organic conipond contains more than two similar terminal groups and all of them are directly attached to the principal chain, then none of them forms a part of the principal chain. Special suffixes are used to name these :-
Functional group
Suffix
\( \begin{array}{ll}--\mathrm{CONH}_{2} & \text { Carboxamide } \\ --\mathrm{CN} & \text { Carbonitrile } \\ --\mathrm{CHO} & \text { Carbaldehyde } \\ -\mathrm{COOH} & \text { Carboxylic acid }\end{array} \)
Carbon atoms of these terminal groups are not counted in the principal chain. If any one of these terminal groups is not directly attached to the parent chain and forms the part of side chain, then the longest chain is selected containing two such similar groups at its two ends. The groups present in the side chain are treated as substituents and are indicated by suitable prefixes.
Indicate whether the following IUPAC names are true (a) or false (b)
Propane-1,2,3-tricarboxylic acid
True (a)
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