Which of the following statements is/are true?

I. The hydrocarbon methane (CH₄) will dissolve completely in acetone (CH₃COCH₃).

II. Ammonia (NH₃) will form a heterogeneous mixture with carbon tetrachloride (CCl₄).

III. Pentane (C₅H₁₂) will form a homogeneous mixture with carbon tetrabromide (CBr₄).

IV. Methanethiol (CH₃SH) is miscible in fluoromethane (CH₃F).