Question

range the following groups in order of increasing priority (Cahn-Ingold Prelogue Sequencing Rules). 1 = highest, 6 = lowest -
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Answer #1

1) -OCH3

2) -COCH3

3)-CH(OH)2

4) -CH2CH2Br

5) -CH=CH2

6)-CH2C(CH3)3

explanation :

priority is based on atomic number . more atomic number more priority . so -OCH3 here O directly connected.

next C in all cases . C next connected atoms we need to look at. C is connected to two OH groups and -COCH3

here also -C=O means C connected to two O's . so it will be next and C(OH)2 next

4) Br is higher atomic number so give first priority.

5) double bond is more priority than single bond

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