1. Arrange the following groups in order of decreasing priority that would allow
ID: 838429 • Letter: 1
Question
1. Arrange the following groups in order of decreasing priority that would allow you to determine E/Z, or R/S. Provide a string of letters (e.g. abcd) as an answer with the highest priority listed first, lowest priority last:
a) -CH3 b) -CH2OH c) -CH2NH2 d) -CH2BR
2. Arrange the following groups in order of decreasing priority that would allow you to determine E/Z, or R/S. Provide a string of letters (e.g. abcd) as an answer with the highest priority listed first, lowest priority last:
a) -F b) -CH2OH c) -CHO d) -CH3
Explanation / Answer
CH2Br > CH2OH > CH2NH2 > CH3 DBCA
Br has the highest priority since it has the highest atomic number (35). Next comes CH2OH because O has a higher atomic number than N (8 vs 7). And last is CH3 since it is only substituted by H, atomic number =1
-F>-CHO >-CH2OH> -CH3 ACBD
Flourine has highest atomic number,.Next comes CHO as it is double bonded(counted as two oxygens) to carbon. Next comes CH2OH because O has a higher atomic number than H. And last is CH3 since it is only substituted by H, atomic number =1
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