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2015-06-21T13:21:28+05:30

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(1) there r 4 single bonds, 1 double bond , 4 triple bonds in the molecule of tetracyanoethylene
so there is 4+1+4 = 9 sigma bonds
& 0+1+(2×4) = 9 pi bonds
(2) according to V.B.T the bonds in methane are fromed due to the overlapping of s orbital of hydrogen & p orbitals of carbon (sigma bond)
6 3 6