Question

Which of the following is NOT a proper IUPAC name? A) 1-cyclopentanone B) 1-pentanone

Which of the following is NOT a proper IUPAC name?

A) 1-cyclopentanone

B) 1-pentanone

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Answer #1

1-cyclopentanone is not a proper IUPAC name because in cyclic compound the carbon atoms are involved in a ring so it is not required to give the number 1 to the carbon atom bearing the functional group. Also there is no other substituent or other functional group present so we do not need to specify the number.

However in a straight chain it is necesaary to specify the carbon atom bearing the functional group even when there is no other substituent of functional group present.

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