Question

2. Draw the structure of the cation responsible for the base peak (m/z=58) in the mass spectrum of 3-aminopentane shown below:

3. Below is given the mass spectrum of a simple alkane. What is the chemical formula of the alkane? What is the name of the alkane? Explain how you determined the exact structure of the alkane from the observed fragments.

4. Below is a mass spectrum of an ester. Identify the ester. Consider that the dominant fragmentation pathway involves a-fragmentation at the carbonyl. Also the alkyl group attached to the ester oxygen is observed as a fragment in this spectrum (the m/z=70 peak is not very useful here).

1:58 OLTE A 92% Read Only - You can't save changes to this file. 2. Draw the structure of the cation responsible for the base peak (m/z=58) in the mass spectrum of 3-aminopentane shown below: ששון (C2H)2CHNH2 Realtive Abundance 126 20 40 60 80 100 3. Below is given the mass spectrum of a simple alkane. What is the chemical formula of the alkane? What is the name of the alkane? Explain how you determined the exact structure of the alkane from the observed fragments. Realtive Abundance M: m/z620 40 60 71 80 100 4. Below is a mass spectrum of an ester. Identify the ester. Consider that the dominant fragmentation pathway involves a-fragmentation at the carbonyl. Also the alkyl group attached to the ester oxygen is observed as a fragment in this spectrum (the m/z = 70 peak is not very useful here). 100 Realtive Abundance | 15 m/z620 $170M 60 80 40 100

Answer 1

ЕТ لا - -CH₂ HC - CHz itt H = CH – CH₂ - CH3 m/3=58 Answer: CH-CH₂ - CH = NH₂

1 CH₃ 3) chemical formula: CH₃CH, _CH_CH_CH2 n-hexane All major peaks are separated by a m3 value of 14 i. e, a chly unit w im - onto = 86 m/3 = #1 ^t mig= 43

4 ester: 20-4_43 EI t m/3 = 43 (base peak)