試題詳解

47. A compound which EI-MS spectrum is shown below, has M⁺ = m/z 156, M⁺2 = m/z 158, and m/z = 77 (base peak). What is the possible formula for this compound?  
(A) C₅H₁₀Cl
(B) C₅H₁₂Br
(C) C₆H₅Cl
(D) C₆H₅Br