Spectroscopic Identification of Organic Compounds

Explain spin-spin coupling in NMR spectroscopy. Show the spin-spin coupling in $1,1,2-$trichloroethane.

Explain the use of the Pascal’s triangle in ${}^1\mathrm{H}$ NMR spectroscopy along with Pascal’s triangle.

Using section $27$ of the Data booklet, predict the high-resolution ${}^1\mathrm{H}$ NMR spectrum of ethyl ethanoate. 

A part of section $27$ of the Data booklet is given below for the reference.

Using section $27$ of the Data booklet, predict the high-resolution ${}^1\mathrm{H}$ NMR spectrum of butan$-2-$one. 

A part of section $27$ of the Data booklet is given below for the reference.

Explain the reasons for use of TMS as a reference standard in ${}^1\mathrm{H}$ NMR spectroscopy.

The ratio of intensities for a triplet signal in a high-resolution ${}^1\mathrm{H}$ NMR spectrum of $1,1,2$-Trichloroethane is 

In a high-resolution ${}^1\mathrm{H}$ NMR spectrum of $1,1,2$-Trichloroethane, the signal due to $>{\mathrm{CH}}_2$ protons is a doublet. Give reason.

In a high-resolution ${}^1\mathrm{H}$ NMR spectrum of $1,1,2$-Trichloroethane, the signal due to $>\mathrm{CH}-$ protons is a 

Predict the appearance of the high-resolution ${}^1\mathrm{H}$ NMR spectrum of$1,1,2$-Trichloroethane.

Predict the number of peaks and the relative areas under each peak on the low-resolution proton NMR spectrum of propanone.

Predict the number of peaks and the relative areas under each peak on the low-resolution proton NMR spectrum of chloroethane, ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}$.

In $1,1,2$-trichloroethane, the splitting pattern occurring due ${\mathrm{H}}_1$  in a high resolution H NMR spectroscopy is:

Predict the number of peaks and the relative areas under each peak on the low-resolution proton NMR spectrum of methanol, ${\mathrm{C}}_6{\mathrm{H}}_6$.

Predict the number of peaks and the relative areas under each peak on the low-resolution proton NMR spectrum of methanol, ${\mathrm{CH}}_3\mathrm{OH}$.

Explain why tetramethylsilane (TMS) is used as a standard in NMR spectroscopy.

State the use of single-crystal X-ray crystallography technique.

In H NMR stectroscopy, a triplet has an intensity ratio of $1:$_____$:1$.

What is the advantage of using tetramethylsilane as the reference standard in H NMR spectroscopy?

In a ${}^1\mathrm{H}$ NMR spectrum of Propanoic acid, the ratio of intensities of  $-{\mathrm{CH}}_3$ proton's signals is $1:2:1$. Give reason.

Why does $-{\mathrm{CH}}_3$ signal of Propanoic acid split into a triplet in its ${}^1\mathrm{H}$ NMR spectrum?