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STRUCTURE OF ETHYNE{C₂H₂} _{SP-HYBRIDISATION
ONE MOLECULE OF ETHYNE HAS 2 CARBON ATOMS AND 2 HYDROGEN ATOMS
THE GR &EXITED STATE OF CARBON ARE GIVEN BELOW
ground state:1s² 2s² 2p¹x}2p¹_y _{exited state:} 1s²2s¹2p¹_x 2p¹_y 2p¹_z

one 2s &one 2p_x orbital of each carbon atom undergo sp hybridisation to give 2 identical sp-hybrid orbitals.
these r oriented at an angle 180⁰ .

one hybrid orbital of each atom overlaps wit the other to form 1 c-c sigma bond . the other hybrid orbital of each carbon atom overlaps with 1s atomic orbitals of hydrogen to form 2 carbon hydrogen sigma bonds.
the unhybridised 2p_y orbital s of both the carbon atom s over lap side ways to form 1 carbon carbon pie bond .
similarly the 2p_z orbitals of both the carbon atoms overlap on sideways to form another carbon carbon pie bond .

COMPOSITION OF ETHYNE MOLECULE:
   Ethyne molecule consists of two C-atoms and two H-atoms (C₂H₂).
   NATURE OF HYBRIDIZATION:
   In ethyne molecule, each carbon atom is Sp-hybridized. Due to Sp-hybridization each carbon atom    generates two Sp-hybrid orbitals. In this way there exists four Sp-orbital in ethyne. These Sp-orbital    are arranged in linear geometry and 180^o apart. Remaining py and pz unhybrid orbitals of each carbon    atom lie perpendicular to the plane of Sp-orbitals.
   SIGMA BOND FORMATION:
   One Sp-hybrid orbital of each carbon atom overlaps to produce one sigma bond between two
    C-atoms.The remaining one Sp-orbital of each C-atom overlaps with one H-atom to produce sigma    bond.
   Pi-BOND FORMATION:
   Py and Pz orbital of two carbon atoms are un-hybrid and make parallel overlapping to produce pi-bond.
   BOND LENGTH:
   The C--H bond is 1.09A and C-C is 1.2A.^o.
   BOND ANGLE:
   HCC bond angle is 180^o.

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