The only prefix which is used when putting the substituents in alphabetical order is :
A
nano
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B
number
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C
iso
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D
both B and C
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Solution
The correct option is A iso If there are two or more different substituents they are listed in alphabetical order using the base name (ignore the prefixes). The only prefix which is used when putting the substituents in alphabetical order is iso as in isopropyl or isobutyl.