Question

short note on single and tripled carbenes

Answer 1

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SINGLET CARBENE-

In singlet state  carbon atom is in sp2hybridisation state. One of sp2 hybrid orbital contains  unshared electron  pair with opposite spins & two sp2 hybrid orbitals  form two covalent bonds . The geometry is planar.There is no magnetic moment in this state.

TRIPLET CARBENE –

In many triplet Carbene , carbon atom is in sp hybridization state. Two hybrid orbitals form sigma bond . Two remaining electrons with parallel spin occupy mutually perpendicular py & Pz orbitals. Geometry is linear . Such carbene would have magnetic moment.

Triplet carbenes are also known where carbon atom is in sp2 hybridisation state.Two nonbonding electrons occupy an sp2 atomic orbital & an unhybridized  p-atomic orbital with parallel spin.Their geometry is bent .

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