Which of the following is the IUPAC name of tetra-tert-butylmethane?

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3, 3-Bis(1, 1-dimethylethyl)-2, 2, 4, 4-tetramethylpentane

Both (I) and (II)

3,3-Di-tert-butyl-2, 2, 4, 4-tetramethylpentane

1, 1, 1, 1-tetra-tert-bytylmethane

answer is D.

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The correct IUPAC name of tetra-tert-butylmethane is "3,3-Di-tert-butyl-2,2,4,4-tetramethylpentane" as well as "3,3-Bis(1,1-dimethylethyl)-2,2,4,4-tetramethylpentane". Both refer to the same structure, making option (d) — Both (I) and (II) — the correct answer.

The answer aligns with IUPAC nomenclature conventions.
Both (a) and (b) are accepted IUPAC names for the same hydrocarbon as shown in credible chemistry sources.

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