The Compound Butanone Does Not Need a Number to Specify

The compound butanone does not need a number to specify the location of the carbonyl group on the parent carbon chain.Which of the following best explains why?

A) The C=O is assumed to be on C-1 of the parent chain if it is not specified.
B) The C=O can only be on C-2 of the parent chain in this compound for it to be a ketone.
C) The C=O is on an end carbon in this compound,and therefore does not need to be specified.
D) The location of a C=O does not need to be specified for a cyclic ketone.
E) The location of the C=O in this compound is not significant to the name.

Correct Answer:

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