Question

1,4-Pentadiene has a AHhydro = -254 kJ/mol while trans-1,3-pentadiene has a AHhydra = -226 kJ/mol. Explain this difference in heat of hydrogenation.

Answer 1

trans-1,3-pentadiene is more stable than 1,4-pentadiene due to presence of a conjugated double bond.

Step-by-step explanation:

Here,
`\Delta H_(hydro)=H(hydrogenated pdt.)-H(diene)`

H(hydrogenated pdt.) is same for both 1,4-pentadiene and 1,3-pentadiene as they both produce pentane after hydrogenation

H(diene) depends on stability of diene.

More stable a diene, lesser will be it's H(diene) value (more neagtive).

trans-1,3-pentadiene is more stable than 1,4-pentadiene due to presence of a conjugated double bond.

Hence,
`\Delta H_(hydro)` is higher (less negative) for trans-1,3-pentadiene