Question

numbers 2 and 5 please!

Step 2 Oxidation of Benzoin to Benzil. HNO3 (conc.) OH C14H Mol. Wt.: 210.23 C14H1 Mol. Wt.: 212.24 Ox: OH red: redox: 3 +2 HNO33 + 2 NO (g)4H2O он cr но NaOH molecular formula? molecular formula? MW? 97 mL? (for liquids) d? (for pure liquids) M? (for solutions) mmol? 97 mL? (for liquids) d? (for pure liquids) M? (for solutions) mmol? molecular formula? MW? g? mL? (for liquids) molecular formula? MW? 97 mL? (for liquids) d? (for pure liquids) mmol? (for pure liquids) M? (for solutions) mmol? To be included into the data analysis report: I. Calculations for limiting reagent and % yield 2. What is the mechanistic role of the thiamine in the reaction? 3. Find the literature melting point of the product (reference!) and compare it with your melting point. 4. Interpret your spectra and compare them with the following IR and NMR spectra of the product (shown below). Does this analysis confirm the identity and purity of your product? Why or why not? 5. Find the description and physical properties of NO and NO2.

Answer 1

2) In normal benzoin condensation, cyanide is added to creat cyanohydrin which is then converted to carbanion and that leads to attack to another molecule of benzaldehyde to give benzoin. Similarly, in thiamine mediated benzoin condensation it act as a cyanide 0 HO IIPh H20 Ph Ph он ње 8

5) NO: Nitric oxide is a free radical molecule without any color. Upon present in the air it reacts ith the water moelcule to produce NO2 radical and then to the nitric acid. It also may be a cause to ozone layer depletion. Molar mass: 30 g/mol Density: 1.34 g/mL Color. Colorless gas MP: -164°C BP:-152°C NO2: Nitrogen dioxide is brown colored gas at RT. This is one of the important oxides of nitrogen used in manufacturing of HNO3. It is also one of the major source of air pollution. Molar mass: 46 g/mol Density: 1.88 g/mL Color: brown gas MP:-9.3°C BP: 21°C