Question

JEE Mains question is in the image

Answer 1

4. is the correct answer ...

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Answer 2

we have to check the correct IUPAC name of the given compound.

1. 2 - methyl - 5 - oxo- hex - 3 - enoic acid
2. 5 - formyl - 2 methyl hex - 3 - enoic acid
3. 2, 5 - dimethyl - 5 - formyl - pent - 3 - enoic acid
4. 2, 5 dimethyl- 6 - oxo - hex - 3 - enoic acid

solution : start numbering from the bond where Hydroxyl group has attached.

see diagram, here numbering has shown.

now after numbering, you can easily write IUPAC name of given compound.

so the correct IUPAC name of it is ...

2, 5 - dimethyl - 5 - oxo - hex - 3 - enoic acid.

Therefore the correct option is (4) 2, 5 - dimethyl - 5 - oxo - hex - 3 - enoic acid.