Question

Represented belo Led below are the NMR spectra with their corresponding IR.match the groups to the spectra provide a brief explanation for the assignment of the functional group. below and provide Continued on next page Alkane Alkene Alkyne 3º Amine Ether

Answer 1

Spectrum 1: For ether. In IR presence strong C-O stretching peak at 1150-1085 cm-1. Also, in NMR, due to the presence of highly electronegative oxygen (H-C-O) near to hydrogen atom, $\delta$ value for the corresponding hydrogen is larger compare to all other spectra (~6ppm).

Spectrum 2: For alkane. In IR presence of C-H stretching peak at 3000 cm-1. Also, in NMR, C-C-H hydrogen atom gives peaks $\delta$ =0.9ppm and also (C-CH-C) hydrogen on secondary or tertiary carbon gives peak intensity at 1.3-1.4 ppm.

Spectrum 3: For 30Amine. In IR presence of C-H strong and broad stretching peak at 3100-3000 cm-1 and C-N medium stretching peak at 1250-1000 cm-1. Also, in NMR, N-C-H hydrogen atom gives peaks $\delta$ =2 ppm.

Spectrum 4: For alkyne. In IR presence of a broad and strong peak at 3000-2800 cm-1Also, in NMR, C$\equiv$C-H hydrogen atom gives $\delta$ =2.5ppm.

Spectrum 5: For alkene. In IR presence of C=C weak stretching peak at 1680-1650 cm-1 and C-H stretching at 3100-3000 cm-1. Also, in NMR, (C=C-CH) hydrogen atom gives peaks $\delta$ =1.9 ppm.