Draw and explain potential energy diagram for the reaction of addition of HCl to 1, 3- butadiene at a low and high temperatures.
The potential energy diagram for the reaction of addition of HCl to 1,3-butadiene at low and high temperatures can be explained as follows:
At low temperature:
1. Reactants: In the initial stage at low temperature, 1,3-butadiene (a conjugated diene) and HCl (hydrochloric acid) are the reactants. Butadiene consists of two double bonds with alternating single bonds between carbon atoms, making it a conjugated system.
2. Activation
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In the following pairs which of the carbocation is more stable and why?
i) NC – CH – CH2 +CH2 CH3 or NC - CH2 - +CH2 H2
sec. carbocation p – carbocation
ii) CH3 CH2 +CH - CH2 CH2 CH3 or CH3 (CH2)4 +CH2
sec. carbocation p – carbocation
Complete following reactions:
Aromatic aldehydes are less reactive than aliphatic aldehyde.
Taking suitable examples, discuss the migrating aptitude of the migrating group in
Pinacol-pinacolone rearrangement reactions.
How would you prepare cis and trans alkene from alkyne? Give its mechanism.
Using FMO method explain why [1,3] sigmatropic rearrangement of protons in
alkenyl chain does not occur.
How free radicals are generated using redox reaction? Give at least two examples.
What are the major advantages of such reactions?