Question

Which one has more priority according to IUPAC naming? double bond or halogen group​

Answer 1

Answer:

Double bond has priority in naming because it is considered a functional group. Halogen is acting as a substituent.

Answer 2

Explanation:

First priority goes to secondary suffix, then to ene and yne and then to prefix.

HO-CH2-CH2-CH2-CH=CH2

Here HO group is represented by secondary suffix (ol) and will get priority over C=C. The IUPAC Name will be

Pent-4-en-1-ol

HO-CH2-CH2-CO-CH=CH2

Here CO group is represented by secondary suffix (one) while HO group is represented by secondary prefix (hydroxy). In this case C=C will get priority over -OH. The IUPAC Name will be

5-Hydroxypent-1-en-3-one