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Question

When two or more substituents are present on the parent chain, such groups are named in their:

A
alphabetical order
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B
position number
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C
functional order
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D
none of the above
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Solution

The correct option is A alphabetical order
When two or more substituents are present on the parent chain, such groups are named in their alphabetical order. For example, correct IUPAC name for CH3CH2CH(C2H5)CH(CH3)COOH is 3-ethyl-2-methylpentanoic acid and not 2-methyl-3-ethylpentanoic acid. Thus, ethyl is named before methyl as in alphabetical order, 'e' comes before 'm'.

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