Question

The IUPAC nomenclature of a given compound is .
${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{CH}}_2-\mathrm{CH}={\mathrm{CH}}_2$

• A. penta-2,4-diene
• B. penta-1,4-diene
• C. pent-1,4-diene

Answer 1

The correct option is B penta-1,4-diene

The carbon chain has five carbon atoms in the parent chain. So, the word root is 'pent'.
There are two double bonds in the given chain so the suffix is diene. The positions of double bonds are at 1 and 4. Also, when there are two double bonds 'a' is added after the word root.

Hence the IUPAC nomenclature of the compound is 'penta-1,4-diene'.