Question

d) Draw the structure of the most polar compound and draw an arrow (through the structure) representing the overall/net dipole moment of the compound. 3) Suppose that your TLC showed that the compounds had not travelled away from your loading spot. What would be an easy condition to change to make the compounds travel up the TLC plate)? Briefly, state specifically what new condition might you try! (0.5) New conditions you could try is dotting more in the same spot, or try to do tro "trial spots two spots for each frachon is gee if it was just the placement. 4) You are trying to separate a mixture of the compound below. Label the compounds in order of expected elution from an alumina column (start with #1 as compound that would elute first), (0.5) naphthalene 2-naphthol benzaldehyde benzoic acid Elution #: . (0.5) 5) a) What is the index of hydrogen deficiency of fluorene? b) What is the index of hydrogen deficiency of fluorenone?

Answer 1

3) In TLC, eluant is necessary to make the compounds travel up during elution.Choose a proper eluant depending on the nature of the compounds to be eluted.

4)#1.naphthalene

#2.benzaldehyde

#3.2-naphthol

#4.Benzoic acid cannot be eluted as being acidic it reacts with alumina(amphoteric) to form salt

5)a)Flourene. The index of H2 deficiency indicates the degree of unsaturation(DU)(=no. of moles H2 to be added to an unsaturated compound to make it saturated)

For flourene, the DU is =9( 3 rings and 6 double bonds)

b)Flourenone

For flourenone, the DU=10(3rings and 7 double bonds)