Question

1. Most of the class will be brominating trans-stilbene (part B) and the rest cis-stilbene (part A). For this assignment write a detailed procedure in your lab notebook for Part B. Upload a picture/scanned copy (5 pts). Tip: If you write the procedure down the left half of the page, you can leave space to record your measurements/observations down the right side of the page. If you end up using cis-stilbene in the experimental there will only be a few changes to make on the day of lab. 2. Your lab manual proposes 3 possible mechanisms for bromination. During this lab, you will determine which product(s) formed during the bromination of stilbene. (9 pts) a. Four possible products from the bromination of trans-stilbene are shown below. Label the chiral centers as Sor R. Ph н., Br ... Ph H Phi Br Br / OVH H Ph A Br Br Ph Н... Br H Phi 17 Ph Ph b. The enantiomer of structure A is_ c. The enantiomer of structure D is: d. List the letters corresponding to the meso structures, if any. " e. Which structures, if any, are chiral molecules:_ f. Which structures, if any, are achiral molecules: 3. Draw proper Lewis structures for each molecule below. Remember to include all bonds, lone pairs, and formal charges. No partial credit. (6 pts) trans-stilbene acetic acid chlorine (C12) bromine (Bra) nitric acid sulfuric acid

Answer 1

Ans. 2: (a) Ph Br н Br Ph HIшии R Phlшши S Ph Н Br Br В A Ph Br н Br Ph H Phlш HIllm Ph н Br Bг С (b) Enantiomer of structure A is Ph Br Br Ph Hill Ph Phш н Br н Br Mirror In enantiomers the configuration of chiral centers should change but in case if structure A this is not the case (c) Enantiomer of structure D is Н Br Br н PhIll Ph וןוווPh Phш H Br н Br Mirror (d) Meso structure is A (e) Chiral molecules are B, C and D (f) Structure A is achiral molecule due to plane of symmetry