(Solved):   Thank you! nula \( \mathrm{C}_{6} \mathrm{H}_{15} \mathrm{~N} \) \( 1.27 \) (quintet NMR a ...

 

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nula \( \mathrm{C}_{6} \mathrm{H}_{15} \mathrm{~N} \) \( 1.27 \) (quintet NMR and 'e. (25 marks') 5. The mabo spectrum above is of 4-methyl-2-pentanone \( \left(M^{+} \mathrm{m} / \mathrm{z}\right. \) 100) and it affords peaks at \( \mathrm{m} / \mathrm{z} 85,58,57 \), and 43 as the four most abundant fragments. Provide structures and mechanism of formation for all of these fragments. ( 2 marks for each structure, 3 marks for each mechanism. 20 marks total.)