53. An acylium ion is often produced as a fragment in the MS of which of the following class of organic compounds? (A) ketones (B) ethers (C) alkyl halides (D) alcohols

56. Which of the following normally occurs in a molecule when a photon of infrared light is absorbed? (A) An electron moves to an orbital of higher potential energy (B) The vibration energy increases (C) An electron changes alignment in a magnetic field (D) The molecule gains an electron