Q86 / 180 · NEET 2026 (Re-NEET) · Chemistry
Among the following, the compound having conjugated double bonds is
- Ahepta-1,6-diene
- Correct answerBhepta-1,3-diene
- Chepta-1,4-diene
- Dhepta-1,5-diene
Solution
Conjugated double bonds are separated by exactly one single bond.
In hepta-1,6-diene, the double bonds are at C1 and C6, separated by three single bonds.
In hepta-1,3-diene, the double bonds are at C1 and C3, separated by exactly one single bond (between C2 and C3). Thus, it has conjugated double bonds.
In hepta-1,4-diene, the double bonds are at C1 and C4, separated by two single bonds.
In hepta-1,5-diene, the double bonds are at C1 and C5, separated by three single bonds.
Answer: hepta-1,3-diene
In hepta-1,6-diene, the double bonds are at C1 and C6, separated by three single bonds.
In hepta-1,3-diene, the double bonds are at C1 and C3, separated by exactly one single bond (between C2 and C3). Thus, it has conjugated double bonds.
In hepta-1,4-diene, the double bonds are at C1 and C4, separated by two single bonds.
In hepta-1,5-diene, the double bonds are at C1 and C5, separated by three single bonds.
Answer: hepta-1,3-diene
Hence, the correct answer is option: 'B'.