Which of the compounds given below can be deprotonated by CH₃O⁻ in an acid-base reaction that favors product formation? (pK_a of CH₃OH = 15.9)
(i) HCOOH (pK_a = 3.7)
(ii) CH₃NH₂ (pK_a = 40)
(iii) NH₄⁺ (pK_a = 9.4)(iv) HC≡CH (pK_a = 25)

• A. (i), (ii), (iii) and (iv)
• B. (i), (ii) and (iii)
• C. (i) and (iii)
• D. (ii) and (iv)

Answer: (C)