Write the most probable formula for: (note that x in each case represents an unknown subscript)
(i) CH_xF₃
(ii) BF_x
(iii) NH_x
(iv) SiF_x

• A. (i) CH₂F₃
  (ii) BF₃
  (iii) NH₃
  (iv) SiF₄
• B. (i) CHF₃
  (ii) BF₄
  (iii) NH₄
  (iv) SiF₄
• C. (i) CHF₃
  (ii) BF₄
  (iii) NH₃
  (iv) SiF₄
• D. (i) CHF₃
  (ii) BF₃
  (iii) NH₃
  (iv) SiF₄

Answer: (D)