In a similar procedure the infrared spectrum of the crude acid chloride revealed the presence of an impurity having two strong bands at 1763 and 1720 cm-1. Examine of the impurity by mass spectrometry revealed a parent ion at m/e peak of 254. As well present were strong peaks at m/e = 119 and m/e = 91. Explain what is the product +HCl?
Explain what fragments were responsible for the strong peaks at m/e = 119 and m/e = 91?