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Per NCERT §3.3, the IUPAC system numbers the groups in the modern table from which range, replacing the older IA…VIIA / VIII / IB…VIIB / 0?
A1A to 8A
B1 to 7
C1 to 18
DI to VIII
Answer & Solution
Correct answer: C. 1 to 18
Per NCERT §3.3, 1984 IUPAC recommendation: groups numbered 1–18, replacing the old Roman A/B notation.
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