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3) In a silica gel TLC experiment, you used Hexane : Ethyl acetate (6:4) solvent system to develop the TLC plate and you found the following picture after looking under UV light: To bring the spot higher (increase Rf), you should use: v a- Hexane : Ethyl acetate (8 : 2) b- Hexane : Ethyl acetate (1 : 1) - C- Hexane : Ethyl acetate (7:3) d) Hexane : Ethyl acetate (9:1) e- Reis a constant and cannot be increased
6) Organic compound A boils at 60°C/20 mm Hg and B at 60°C/2 mm Hg. Which of the following statements is correct? 1 Pp 7 BP a. A has a higher bp than B at 760 mm Hg a b) A has a lower bp than B at 760 mm Hg A has a the same bp as B at 760 mm Hgx d. A has a higher bp than B at 20 mm Hg x e. Liquids A and B cannot boil at 760 mm Hg x C. I do
18) The signals for which of the following pairs of compounds are indistinguishable in an NMR spectrum? Br. а. and Br Н Н Н 0 0 b. and Н ОН он С and НО НО d. ОН and ОН
mal a 0.1 mul eg 25) An experiment that started with 20g of Compound A (MW 200, d=1.50) resulted in(5g of Product B (MW 100, d=0.50). Based on the given, what is the percent yield? d= m > mo n. Mr U d. 0.25 % e. 0.75% - d = a 25% b. 50% c. 75% v=238 mt. 6 lo gt
Consider the following silica gel TLC plate of compounds A, B, and C developed in hexane as an eluting solvent: Rear EO solven.l front 'B BE P.Ro Rfc- ahulu K(3 ora origin A B C a) Determine the Rf values of compounds A, B, and C. b) Arrange compounds, A, B, or C, in terms of polarity (least to most polar)? B CCC c) What would you expect to happen to the Rf values if you used acetone instead of hexane as the eluting solvent? More, pyar Polar will change for 3 profuct, if use Re increased more present age of herane the poster decreas