Which of the following is incorrect `IUPAC` name ?

Which of the following is not correct IUPAC name

Which of the following is/are incorrect IUPAC name ?

Which of the following is/are incorrect IUPAC name.

Which of the following is/are incorrect IUPAC names ?

Which of the following is/are incorrect IUPAC name.

Which of the following is/are incorrect IUPAC name.

Which of the following is/are incorrect IUPAC name ?

Which of the following is/are incorrect IUPAC name/ (s):

Which of the following is/are incorrect IUPAC name/ (s):

Which of the following is/are incorrect IUPAC names (A) 2-ethyl-3-methylpentane (B) 4-formyl butanamide (C) 2,3-dimethyl cyclohexene (D) 3-carboxy pentanoic acid