Question

question 4 and 5 please

CHAP =-226 kJ/mol. Explain this difference in heat of hydrogenation. 5. What are the three types of polyunsaturated compounds? Give examples of all three.

Answer 1

• Heat of hydrogenation is the enthalpy of catalytic hydrogenation of alkenes and is always negative.i.e heat is released. Hence, the process is exothermic.
• The more stable the alkene is, smaller will be the numerical value of the heat of hydrogenation.
• Here, 1,3-pentadiene is a conjugated diene while 1,4-pentadiene is non-conjugated.
• Conjugated dienes are more stable than non-conjugated dienes.
• Therefore, the numerical value of heat of hydrogenation is lower for 1,3-pentadiene as compared to that of 1,4-pentadiene
• The structure of both the alkenes are as follows:
• 
  ,3-pentadiene CCenjugated) T,4-pentadvene ne cenfug ated)
  
• 
  plyeriatnsted Compeunds The follaui are ale bends Cougated 1n thcee, two double are ingle bend ie ditecnating the deparcted double bend a are t,3-heptadiene ) salated .ajugated poeated buy uheeein two ahes e Lre non Jaonds double are mox than igle band One ,S-heptadiene nen-cenjufated wherecin hande also There 3) Cumatlated are the two dauble imilar atom are cenneted to 213-hezadiene
  
• Thank You!