47. Which of the following characterizes the unusually intense peak of alkyl chlorides in MS spectrometry? (A) M + 1 peak (B) M + 2 peak (C) base peak (D) parent peak

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