試題詳解

14. Which of the following statement is correct?
(A) CO₂ is a linear molecule and therefore there is no bending vibration.
(B) CO₂ has 4 vibrational modes and all of them are IR-active.
(C) The frequency of the symmetric stretching vibration mode is lower than that of the antisymmetric stretching mode for CO₂.
(D) The point group of CO₂ is C_∞v.
(E) CO₂is a well-known greenhouse gas, but N₂ is not because it has no vibration.