mostly need help with a, b ,c

4. A student is monitoring a reaction involving compounds C and D using TI Compound C has an Rp value of 0.43; compound D has an Rf of 0.40. a. Draw a picture of the TLC plate at the beginning of the reaction. b. Draw a picture of the TLC plate after 50% completion (50% of the C molecules have been converted to D molecules). C. Draw a picture of the TLC plate at the end of the reaction (all of the C molecules have been converted to D molecules). d. Why is it important to use a co-spot