Choose the correct option regarding the stability of free radical formed after breaking of the bonds indicated by the arrows:
A
(a) is more stable than (b)
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B
(c) is more stable than (b)
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C
(a) is the least stable.
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D
(c) is the most stable.
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Solution
The correct option is C(a) is the least stable. Free radical formed after breaking of bond (a) : 1α−Hydrogen is present.
Free radical formed after breaking of bond (b) : 7α−Hydrogens are present.
Free radical formed after breaking of bond (c) : 4α−Hydrogen are present.
Since,
Free radical stability ∝ Number of α-H.
Stability order is : (b)>(c)>(a)