Question

NMR Spectroscopy

how many peaks will the methyl group be split into and how many peaks will the methylene group with the OH functional group be split into?

Answer 1

Methyl group with OH funtional group ( e.g. Methanol) will show a singlet in NMR spectrum that means it will not be splitted as all the hydrogens are in a similar chemical environment.

On the other hand methylene group with OH funtional group ( e.g. ethanol) will show a quartate in NMR spectrum that means it will splitted into four lines. Two methylene hydrogens are having three neighbouring hydrogen atoms of methyl group. This is calculated from the n+1 rule which says that  an environment with n neighbours will be split into n+1 multiplets.

structure of methanol: CH₃-OH

structure of methanol: CH₃-CH₂-OH