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Singlet :CCl2 is more stable than singlet : CF2.

Triplet : CH2 is more stable than singlet : CH2.

Singlet : CH2 has planar geometry.

The electrone affinity of .CH3 radical is less than its ionisation energy.

answer is B.

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Detailed Solution

Correct ( 1)Stability order::CF2>:CCl2>:CBr2>:Cl2It is due to more effective overlap(2p(F)−2p(C) or pπ−pπ) bond. Moreover, shortest (F−C) bond length, provides more extensive lateral overlap.(b) Triplet : CH2, is more stable or has lower energy because with two electrons in different orbitals, there is less repulsion than when both are in same orbitals(c) sp2 and planar (d) When C∙H3 gains an electron to become carbanion (C∙∙H3),C-atom acquires stable octet of electrons. When it loses an electron, it becomes unstable with only six electrons.

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