Clearly solve the question in photo
Asked by Vidushi412
16th October 2018,
9:37 PM
Answered by Expert
Answer:
Enthaly of Hydrogenation is amount of heat released when 1 mole compund (alkene) undergo hydrgenation. So, total enthaly relwased per compound during hydrogenation is equal to number of alkene bond times of hydrogenation energy per double bond. But, in case of benzene, it has three double bond which are conjugated i.e. get extra stability due to resonance. So, it releases less enthaly of hydrogenation than excepted due to extra stability i.e due to resonance energy.
So, Resonance energy = ΔHexp - ΔHcal
ΔHhyd for ehtene(one double bond) = -32.7 kcal/ mol
ΔHhyd expected for benzene(3 double bond) = -32.7 * 3 = -98.1 Kcal
But, ΔHhyd actual for benzene given = -49.2 Kcal
So, Resonance energy = ΔHexp - ΔHcal
= -98.1 Kcal - (-49.2 Kcal)
= -48.9 Kcal (ans
)
)
Answered by Expert
17th October 2018,
9:44 AM
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