MHT CET Chemistry Question (2026) — Solution

Step-by-step 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: