Q.3-Methoxyhexane

In the common (trivial) system, an ether is named by citing the names of its two alkyl/aryl groups in alphabetical order, followed by the separate word 'ether'; if both groups are identical, the prefix 'di-' replaces writing the name twice (dimethyl ether, not methyl methyl ether). In the IUPAC system, ethers are instead named systematically as alkoxyalkanes: the LARGER of the two groups is treated as the parent chain, and the smaller group, together with its bridging oxygen, becomes an 'alkoxy' substituent prefix with its own locant (ethoxy, n-propoxy, isopropoxy are common alkoxy-group names). Worked this way, CH3-O-CH3 is methoxymethane, CH3-O-CH2CH3 is methoxyethane, C6H5-O-CH3 (anisole) is methoxybenzene, and CH3-O-CH(CH3)-CH3 is 2-methoxypropane. When a compound has only one substituent, no locant number is needed on the parent name.