16. Which of the following statements is correct?
(A)HBr has boiling point higher than Kr and Cl₂
(B)HF has freezing point higher than H₂O and NaCl
(C) Cl2 has vapor pressure lower than Br₂ and I₂
(D) CO has freezing point lower than N₂ and CO₂
(E)HBr has boiling point higher than HF and HCl

(A) HBr has boiling point higher than Kr and Cl2

• 正確，HBr是極性分子，分子間有較強的偶極-偶極作用力；而Kr和Cl₂是非極性分子，主要受到較弱的倫敦分散力影響

(B) HF has freezing point higher than H2O and NaCl

• 錯誤，H₂O有較強的氫鍵作用力，使得凝固點高於HF；而NaCl在水溶液中形成離子晶體，其凝固點會更高；因此HF的凝固點不高於水和NaCl。

(C) Cl2 has vapor pressure lower than Br2 and I2

• 錯誤，Cl₂的分子間作用力比Br₂和I₂的作用力弱，因此Cl₂的蒸氣壓應該較高；Br₂和I₂分子更大，分子間的倫敦分散力也更強，因此蒸氣壓較低

(D) CO has freezing point lower than N2 and CO2

• 錯誤，CO的凝固點為-205°C，N₂的凝固點為-210°C，CO₂的凝固點為-78.5°C

(E) HBr has boiling point higher than HF and HCl

• 錯誤，HF的沸點高於HBr和HCl，因為HF分子之間有較強的氫鍵，而HBr和HCl的氫鍵較弱，因此HF的沸點最高