Chapter 20, Problem 76IP

Interpretation Introduction

Interpretation:

The spectroscopic structure identification for given corresponding molecular formula should be draw and identified.

Concept Introduction:

$NaB{H}_4$Reduction: The saturated/unsaturated aldehyde and ketones in the presence of sodium metal in ${\text{NaBH}}_{\text{4}}$ and carbonyl compound produced saturated alcohols. The keto group involves in the reduction process of ${\text{NaBH}}_{\text{4}}$, this end up reducing to give the alcohols.

Ni Reduction Reaction: The aldehyde and ketones in the presence of strong metal atoms (like Raney Ni) the carbonyl compound produced saturated alkanes. The keto group involves in the reduction process of Ni, this carbonyl group reducing to give the saturated aromatic (or) aliphatic hydrocarbons.

NMR Spectroscopy: NMR spectroscopy commonly known as MRI (Magnetic Resonance Spectroscopy), it is important Research tool of analysis for different organic molecule and its structures. (or) In other words hydrogen nuclei have spin (odd value) and all nuclei ae electrically charged. The extremal magnetic field is applied an some energy transfer is possible between the lower energy to excited level.

¹H NMR Spectroscopy: The ¹H NMR (or) single hydrogen (H) is the application of NMR spectra with respect to hydrogen nuclei within the molecules of a substance, in order to determine the structure of its molecules.

 ¹³C NMR Spectroscopy: This type of NMR splitting of signals tells us numbers of hydrogens atoms are attached to each carbon. The triangle rule (n+1) C. The chemical shift explains the different hybridization $\left(sp3,sp2,sp.,\right)$ of each carbon atoms. Moreover the chemical shift in carbon NMR spectra arises in the same way as in the ¹H NMR spectrum.

IR Spectra: This important tool of structure analysis different organic molecules and its functional groups. (or) To determine the functional groups present in the given organic compound sample by absorbing frequency in particular range with respect to the group present in the given sample.

Wavenumber (cm^-1): It is defined as the number of waves in one centimeter. The wavenumber indicates the location of each signal with respect to the functional group in the molecule and its unit is ${\text{cm}}^{\text{-1}}$.

To find: The molecular formula for the given molecules