Look at lab procedure and answer all questions below.

Discussion Include: (1) Which gas is being genvoled? what is the reation? (2) Readion explaining hygloscoos nabie of N4BH1 (3) Why do we need 81 cooldown the reec"? (4) Reac for boratac astar hyserolyais (5) Which layen on top lbotiom ? (6) Use of MHBE (7) Why aival atlack is prepored? Procedure: Day (1) Reduction of 2 -metylcyclohexanone with NaBH4. 1. Weigh 0.3g of 2 -methyleyelohexanone (liquid) in to a large test-tube. Measure 1.25mL of Methanol in a graduated test tube and keep it in your bench. Weigh 0.05g of sodium borohydride (caution!t! Hygroscopic- bottle should be capped immediatcly after usell!) in a weighing paper and transferred to the large test tube containing ketone. NaBH4 will be sticky. So use a spatula and/or methanol (1.25 ml, measured previously) to transfer the reducing agent. You may see bubbles forming in the reaction mixture. Which gas is being generated and what is the reaction? Could you write a reaction that explains the hygroscopic nature of NaBH4 ? 2. Cool the mixture in an ice bath (ice and water) for 10 minutes. Reaction happens at Room temperature also. Why we need to cool the reaction? 3. Add 1.25mL of 3MNaOH(10%NaOH) solution to the reaction mixture (to hydrolyze the borate ester). 4. Keep in the ice bath for another 2 minutes to complete the hydrolysis. Could you write a reaction scheme for borate hydrolysis? 5. Add 1mL of water (tap) and swirl to mix well. 6. Add 2mL of t-butyl ether (MTBE). Mix well with a glass rod and allow the layers to separate. Which layer will be organic (top or bottoms)? Which layer contains the required product? Transfer the organic layer to a clean test tube. Could you explain why we use MTBE for exiraction? - 7. Add 2mL of saturated brine (NaCl) solution the organic layer. Mix well and allow the layers to separate. We need organic layer. Top or Bottom? 8. Get another clean test tube, add a couple of boiling chips to it. Record the weight of this tube. Then transfer the organic layer from the above step to the weighed test tube. Using a test tube holder evaporate the solvents in a water bath to get pure 2 -methylcyclohexanol product (liquid). [This step could be performed with a round bottom flask and rotary evaporator.] 9. Weigh the test tube, find the yield of the product, and calculate the \% Yield. 10. Cap the test tube and save it in your cupboard for next week (for IR, NMR and GC analysis). 11. Could you explain why axial attack of Hydride is preforred ( 61% product) over equatorial attack? \% Yield = moles of the product/ moles of the starting material (limiting reagent)