Question

Question: Sketch the NMR spectrum of$\mathbf{C}{\mathbf{H}}_{\mathbf{3}}\mathbf{C}{\mathbf{H}}_{\mathbf{2}}\mathbf{C}\mathbf{l}$, giving the approximate location of each NMR signal.

Short answer

A chemical shift can be defined as the difference in frequency at which trimethyl silane absorbs the operating frequency of the spectrometer. Chemical shift is denoted by$\delta$. The values of chemical shift vary from 1 to 10 ppm.

Step-by-step solution

Chemical shift

A chemical shift can be defined as the difference in frequency at which trimethyl silane absorbs the operating frequency of the spectrometer. Chemical shift is denoted by$\delta$. The values of chemical shift vary from 1 to 10 ppm.

Equation for chemical shift

The chemical shift in terms of frequency while using TMS as the reference is given as:

$\delta =\frac{{\nu }_{\mathrm{s}\mathrm{a}\mathrm{m}\mathrm{p}\mathrm{l}\mathrm{e}}-{\nu }_{\mathrm{T}\mathrm{M}\mathrm{S}}}{{\nu }_{\mathrm{T}\mathrm{M}\mathrm{S}}}\times 10^6\mathrm{p}\mathrm{p}\mathrm{m}$

The value of $\delta$can change from 1 to 10 ppm.

Sketching the NMR spectrum of $\mathbf{C}{\mathbf{H}}_{\mathbf{3}}\mathbf{C}{\mathbf{H}}_{\mathbf{2}}\mathbf{C}\mathbf{l}$ and giving the approximate location of each NMR signal.

NMR spectrum of$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{l}$

Two kinds of protons are present in$C{H}_{3}C{H}_{2}Cl$, and they can split each other. The$\mathrm{C}{\mathrm{H}}_3$signal will be split by$\mathrm{C}{\mathrm{H}}_2$ protons into $2+1=3$peaks. The peak obtained will be upfield from the $\mathrm{C}{\mathrm{H}}_2$protons since the $\mathrm{C}{\mathrm{H}}_3$protons are farther from the $\mathrm{C}\mathrm{l}$.

Then, the $\mathrm{C}{\mathrm{H}}_2$ signals will be split by the $\mathrm{C}{\mathrm{H}}_3$ protons into $3+1=4$peaks. The peak obtained will be downfield from the $\mathrm{C}{\mathrm{H}}_3$ protons since the $\mathrm{C}{\mathrm{H}}_2$ protons are closer to the$\mathrm{C}\mathrm{l}$. The ratio of integration units will be 3:2.