18. Which of the following four fatty acids has the lowest melting point?
(A) CH₃(CH₂)₁₀COOH
(B) CH₃(CH₂)₂₀COOH
(C) CH₃(CH₂)₅CH=CH(CH₂)₇COOH
(D) CH₃CH₂(CH=CHCH₂)₅(CH₂)₂COOH

1. 題目解析本題要求我們比較四種脂...