8. TL C can be used to monitor the progress of a reaction. For example, let\'s s
ID: 1027405 • Letter: 8
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8. TL C can be used to monitor the progress of a reaction. For example, let's say you are performing a dehydration reaction in the laboratory. You are starting with an alcohol and converting it into an reaction takes over an hour to go to completion. Answer the following questions about this reaction: Which of the following scenarios would you observe on the TLC plate as the reaction progresses? Assume a perfect reaction with no side products. Circle the correct answer. () You would observe two spots on the TLC plate as the reaction progresses. The lowest R value spot would decrease in size while the highest Rrvalue spot would increase in size. (ii) You would observe two spots on the TLC plate as the reaction progresses. The lowest Rr value spot would increase in size while the highest Re value spot would decrease in size. (ii) You would observe two spots on the TLC plate. Both spots would remain the same size throughout the experiment. (iv) You would observe four spots on the TLC pl in size while the three highest Re value spots would increase in size. 9. TLC is all about polarity and intermolecular forces (IMF). Answer the following questions to illustrate your understanding of these concepts (a) Which of the following molecules are polar? Circle all of the correct answers. H2S CO2 CH2Br2 CCl4 CO NH (b) Using the capital letters provided, rank the following from highest to lowest boiling point: : CH CHOCH CH Highest BP B: CHsCH:CH.CH OH C: CH CH CH CopH B > C> OCH Page 3 of 4Explanation / Answer
8. Between alcohol and alkene,alcohol is more polar and so Rf value is less for alcohol than alkene. As the reaction progress,so,alcohol spot is decreases gradually and alkene spot is increases gradually. So lowest Rf value spot would decrease in size(as reaction goes,this spot faded gradually) and highest Rf value spot (for alkene) would increase in size. So option (i) is true.
9. (a). Among the following compounds H2S,CH2Br2,NH3 has permanent dipole moment moment and polar.
(b). Among these,acid form dimer by intermolecular hydrogen bonding,alcohol also form hydrogen bonding,but ether does not form any hydrogen bond. Oxygen atom of carbonyl group and hydrogen atom of acid form hydrogen bond with hydrogen atom of another acid and oxygen atom of carbonyl group of that acid and forms dimer,and these bond breaking is much more difficult followed by alcohol hydrogen bond breaking,ether bond breaking is most easier among these. So boiling point order is C>B>A
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