Question

Identify IUPAC name of the following compound.
CH\(_2\)=CH–CH=CH–CH\(_2\)–Cl

• A. 5–Chloropent–2,4–diene
• B. 1–Chloropent–2,4–diene
• C. 5–Chloropenta–1,3–diene
• D. 1–Chloropenta–2,4–diene

Hint:

In IUPAC naming, priority is given to multiple bonds over substituents while numbering the chain.

Answer 1

The Correct Option is C

Step 1: Identify the longest carbon chain.
The compound has a 5-carbon chain with two double bonds.
Step 2: Number the chain to give lowest locants to double bonds.
Double bonds appear at positions 1 and 3 → penta–1,3–diene.
Step 3: Locate the substituent.
Chlorine is attached to carbon number 5.
Step 4: Write correct IUPAC name.
5–Chloropenta–1,3–diene.