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- Nuclear magnetic resonance (NMR) is a technique fundamental in Chemistry as in other areas of Science and fundamental in the elucidation of the structures of new materials. For compounds below, estimate: change in chemical environment, integral, rule of multiplicity and scale. (i) 2 - pentenal (ii) ethylamine (iii) 2-butanone (iv) 1,2-dichlorobenzeneWhich parameter between "solvent polarity function" and dielectric constant show better correlation with the peak positions? (cyclohexane, dioxane, acetonitrile, ethanol, ethylene glycol)The dipole moment of bromobenzene is 5.17 × 10−30 C m and its polarizability volume is approximately 1.5 × 10−29 m3. Estimate its relative permittivity at 25 °C, when its mass density is 1491 kg m−3.
- Shich will have no effect on an Rf value in TCL? the molecular weight of the sample. the hydrogen bonding capability of the stationary phase. the polarity of the sample. the polarity of the eluent.The UV spectrum of acetone shows two peaks of lambda max = 280 nm, e=15 and lambda max=190nm, e=100. Identify the electronic transition for each. Which is more intense?Consider the structure. Which IR absorption band is inconsistent with the structure? 1600 cm−1 1740 cm−1 2900 cm−1 1200 cm−1
- What can be said about the ratios of the multiplet areas in the 1H spectra. for trichloroethene; 1,2-dichloroethane; 1,1,1-trichloroethane; 1,1,2-trichloroethane.Find the major IR Absorption Bands and give a proposed molecular composition/structureThe IR and 1H NMR spectra of an unknown, whose molecular formula is C11H14O3, are shown below. The following questions will guide you in determining the structure.a- Determine the degree of unsaturation of the unknown. Show your calculation.b- Identify three significant bands in the IR spectrum that will help to conclude on the functions that exist in this molecule.