Answer :
Explanation:
The wavelength of a molecule is determined by the length of the conjugated system it contains. In simple terms, the more conjugated double bonds a molecule has, the longer its wavelength will be.
1,3-hexadiene and 1,4-hexadiene are both conjugated diene molecules, meaning they contain two double bonds that are conjugated (alternating single and double bonds).
1,3-hexadiene has the double bonds at positions 1 and 3 along the carbon chain: H2C=CH-CH=CH-CH3
1,4-hexadiene has the double bonds at positions 1 and 4 along the carbon chain: H2C=CH-CH2-CH=CH-CH3
In this case, 1,4-hexadiene would have a longer wavelength compared to 1,3-hexadiene. This is because in 1,4-hexadiene, the conjugated system extends over a longer distance along the carbon chain, resulting in a longer wavelength.
Therefore, 1,4-hexadiene would have the longest wavelength among the two molecules.
Answer: Therefore, 1,3-hexadiene is likely to have the longest wavelength due to the conjugation of its double bonds, allowing for electron delocalization and resulting in lower energy transitions.
Explanation:
The molecule with the longest wavelength among 1,3-hexadiene and 1,4-hexadiene can be determined by looking at their molecular structures.
1. 1,3-hexadiene: In this molecule, the double bonds are conjugated, meaning they are separated by a single bond. The conjugation allows for the delocalization of electrons, which results in lower energy transitions and longer wavelengths in the absorption spectrum.
2. 1,4-hexadiene: Here, the double bonds are isolated from each other by two single bonds. This lack of conjugation restricts the delocalization of electrons, leading to higher energy transitions and shorter wavelengths in the absorption spectrum compared to the 1,3-hexadiene molecule.
