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Derive IUPAC name of following: |
Answer» Solution :(i) Decide substituent order in compound-(i)  The (c ) is not comes in lowest order because second no. is 3. In (a) and (b) the third no, `4 lt 5` so, correct lowest locant order is 1, 2, 4. In these, 1- Methoxy, 2-Chloro, 4-METHYL are SUBSTITUENTS in which 1-Methoxy means anisole. It is common name so, name is 2-chloro-4-methyl anisole. (ii) Decide substituent order in compound (ii)  The order of (c ) is not lowest order because second no. `3 gt 2`. In (a) and (c ), the lowest no. of (a) is 1, 2, 4 because in (a) the third no. `4 lt 5`. `:.` Substituents 1 (amino), 2 (methyl) and 4(ethyl). 1-amino i.e. common name in aniline Name : 4-ethyl-2-methylaniline Always, the substituents name are WRITTEN in alphabetical order. (iii) To decide substituents order, the no-1 is given to `-OH` according to common name  In (a) not lowest order but according to common name it is PHENOL and no.-1 is given to `-OH`. Name : 3, 4-dimethyl phenol |
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