Answer
Verified
394.8k+ views
Hint: A diene is referred as a hydrocarbon which is unsaturated and having two double bonds between carbon atoms, there is one more term which one needs to know and that’s the heat of hydrogenation it is defined as a change in the enthalpy that a diene experienced when it is reacted with hydrogen which is in excess so that the diene is converted into the fully saturated compound.
Complete step by step answer:
Now, as we are familiar what diene and Heat of hydrogenation are let’s know what are the factors we need to consider in comparing the heat of hydrogenation of all the given above diene, the main factor is the stability of the alkenes or dienes, and this stability factor has an inverse relation with the heat of hydrogenation which means the more stable is the alkene the less will be the heat of hydrogenation.
Now, let’s identify the least stable diene as that diene will have the maximum heat of hydrogenation, when we learn about the stability of alkene or diene the conjugated one are the more stable (for a molecule to exhibit conjugation three adjacent p-orbitals should be present) then the non-conjugated or cumulated alkenes, and here the first three mention dienes are conjugated as there can be shifting of double bonds, which provides stability, whereas the fourth diene is cumulated and shifting of double bonds cannot take place hence is least stable diene and has a maximum heat of hydrogenation. The last diene does not shows conjugations can be easily shown with the help of diagram as follows:
So, the correct answer is Option D.
Note:
For an alkene if we need to observe the Heat of hydrogenation it should be at atmospheric pressure and room temperature, the reactants should be in its natural states.
Complete step by step answer:
Now, as we are familiar what diene and Heat of hydrogenation are let’s know what are the factors we need to consider in comparing the heat of hydrogenation of all the given above diene, the main factor is the stability of the alkenes or dienes, and this stability factor has an inverse relation with the heat of hydrogenation which means the more stable is the alkene the less will be the heat of hydrogenation.
Now, let’s identify the least stable diene as that diene will have the maximum heat of hydrogenation, when we learn about the stability of alkene or diene the conjugated one are the more stable (for a molecule to exhibit conjugation three adjacent p-orbitals should be present) then the non-conjugated or cumulated alkenes, and here the first three mention dienes are conjugated as there can be shifting of double bonds, which provides stability, whereas the fourth diene is cumulated and shifting of double bonds cannot take place hence is least stable diene and has a maximum heat of hydrogenation. The last diene does not shows conjugations can be easily shown with the help of diagram as follows:
So, the correct answer is Option D.
Note:
For an alkene if we need to observe the Heat of hydrogenation it should be at atmospheric pressure and room temperature, the reactants should be in its natural states.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
State the differences between manure and fertilize class 8 biology CBSE
Why are xylem and phloem called complex tissues aBoth class 11 biology CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
What would happen if plasma membrane ruptures or breaks class 11 biology CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
What precautions do you take while observing the nucleus class 11 biology CBSE
What would happen to the life of a cell if there was class 11 biology CBSE
Change the following sentences into negative and interrogative class 10 english CBSE