Question

Verify the following statement TRUE/ FALSE: (5 * 155) a. i. For recrystallization, dissolve the component in minimum amount of solvent. ii. Synthesis of Isopentyl acetate is an acid catalyzed esterification reaction iii. Grignard reagent cannot prepare without dry ether solvent. iv. Grinding the Mg turnings increases the rate of reaction for Grignard reaction v. Formation of borneol during camphor reduction is an exo face attack. b. Suppose during separation of toluene (b.p. 111 °C) from cyclohexane (b.p. 80°C) by distillation we got 91% of pure cyclohexane and 95% of toluene. Propose the way you think we can reach >99.5% of purity of each component separation. (2 pts) c. Write down product for the following reaction (1.5 X 2= 3) OH HBr - a. H2SO4 ? b. Hot for Heat 4. a. How do you identify CIS and TRANS isomeric protons (by NMR chemical shift) in BUTENE-2? (2 pts) b. Calculate the coupling constant for 2-assigned peak of chemical shift i) 7.26 and 7.34 respectively in 1H NMR instrument (Consider you are using 500 MHz NMR machine (2 pts) c. The following structure is given for compound A 0NN Compound A i. Identify the splitting pattern expected from the 1H NMR. (2 pts). ii. What type of functional group confirmation you can expect from the IR spectrum? (2 pts). iii. How many different types of carbon you can expect from this compound in 13C NMR? (2 pts)

Answer 1

des (5) at Tu . . e True ldo con ii) True iv) True. Because with increasing ing hours turning, surface area increases hene rate of reaction increases. v) True adott b) for getting y 99.5% of purity of each component we have to follow og fractions distillation method by repeating many times et DON Bor 4ty bryty +H30 mechanism 7 *** H so