Mass Spectrometry
1. This question has 3 part(s).
1.1. An unknown compound, B, is analysed and shown to have a composition of 69.7% carbon, 18.6% oxygen and the remainder is hydrogen.
The following incomplete mass spectrometry and IR spectroscopy data are collected.
Mass spectrum
M+1 peak at m / e = 87.0
Fragment ion peak at m / e = 28
Iinfra-red spectrum
Sharp peak at 1705 cm-1
No broad peak around 3200 cm-1
Calculate the molecular formula of compound B.
1.2. Using Table 1.1 and the incomplete mass spectrometry and infra-red spectroscopy data, identify two possible isomers for compound B.
Table 1.1
Bond | Functional groups containing | Characteristic infrared absorption range (in wavenumber) / cm–1 |
C−O | hydroxy, ester | 1040 – 1300 |
C=C | aromatic compound, alkene | 1500 – 1680 |
C=O | amide | 1640 – 1690 |
C≡N | nitrile | 2200 – 2250 |
C−H | alkane | 2850 – 2950 |
N−H | amine, amide | 3300 – 3500 |
O−H | carboxyl | 2500 – 3000 |
Your answer should include an explanation proving your two possible isomers and disproving one other isomer.
1.3. A mass spectrum peak at m / e = 29 could be used to distinguish between the two remaining isomers.
Identify the fragment responsible for this peak and explain how it can be used to distinguish between the two isomers.
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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