Question

question in the attachment•••​

Answer 1

Answer:

In (a) 2+5+6 is 13 while 3+4+7 is 14. We should always take the numbering which gives the smallest sum. Hence, it is correct.

In (b), you should always give more preference to ethyl. Therefore 3-Ethyl... is correct.

Explanation:

Answer 2

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