In which one of the following molecules the central atom does not have sp³

In which one of the following molecules the central atom does not have sp³ hybridization?

(a) NH₄⁺
(b) CH₄
(c) SF₄
(d) BF₄⁻

SF₄

NH₄⁺, CH₄, BF₄⁻ : sp³ – hybridization, SF₄ : sp³d – hybridization. Correct choice (c).

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