Important Talent Search Exams
|Allen TALLENTEX 2018 (Class 5 to 11)|
|Aakash ANTHE 2017 : 100% Scholarship (Class 8, 9, 10)|
- Bond energy ∝ 1/Stability of free Radical
- Bond length ∝ Stability of free Radical
Sol. If compound after being in free Radical form is very stable (i.e., less energy) it mean it would have possessed more energy initially i.e. it potential energy will be most a < b < c < d
- Potential energy ∝ Stability of free Radical
Ex.2 Compare the bond energies of C – H bond
(At a, b, c, d, e and f position)
e > b > a > f > c = d
Stability order of free Radical that might be formed after removal of H (Homiletically) from the given carbon.
⇒e < b < a < f < c =d
(C – H bond energies)
While drawing the resonating structure of the
(Here in spite of Resonance three alpha (C – H) bond and are available for no bond Resonance.
Therefore extra stable than which have only two a (C – H) bond for hyper conjugation.
Therefore 2o benzylic allylic corresponding to structure (a) is more stable than that of structure (b
Ex.4 Compare the potential energy of CH3 – CH3, CH2 = CH2 and CH ≡CH.Sol.
After making free Radical of the above compounds:
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