Q13 / 150 · MHT CET 2026 (19 April Shift 2) · Chemistry
Which from following structures represents 1,3 butadiene ?
- A
- Correct answerB
- C
- D
Solution
The IUPAC name 1,3-butadiene corresponds to a four-carbon chain with two double bonds located at the 1st and 3rd carbon atoms.
The chemical formula is $CH_2=CH-CH=CH_2$.
Let us analyze the given bond-line structures:
1. The first structure has a five-carbon chain with one double bond at the second position, representing pent-2-ene.
2. The second structure has a four-carbon chain with double bonds at the first and third positions, representing 1,3-butadiene.
3. The third structure has a four-carbon chain with a triple bond at the first position, representing but-1-yne.
4. The fourth structure has a three-carbon chain with a triple bond, representing propyne.
Therefore, the second structure correctly represents 1,3-butadiene.
Answer:
The chemical formula is $CH_2=CH-CH=CH_2$.
Let us analyze the given bond-line structures:
1. The first structure has a five-carbon chain with one double bond at the second position, representing pent-2-ene.
2. The second structure has a four-carbon chain with double bonds at the first and third positions, representing 1,3-butadiene.
3. The third structure has a four-carbon chain with a triple bond at the first position, representing but-1-yne.
4. The fourth structure has a three-carbon chain with a triple bond, representing propyne.
Therefore, the second structure correctly represents 1,3-butadiene.
Answer:
Hence, the correct answer is option: 'B'.