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Answer 1 · 2016-08-27T10:06:17

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$Draw Lewis Structures of the molecule$ $"Draw Lewis Structures of the molecule"$
$Count no. of single bonds ,double bonds and triple bonds in it$ $"Count no. of single bonds ,double bonds and triple bonds in it"$

$Each SINGLE bond \to 1 σ bond$ $"Each SINGLE bond"->1 sigma " bond"$

$Each Double bond \to 1 σ bond and 1 π bond$ $"Each Double bond"->1 sigma " bond" and 1 pi " bond"$

$Each TRIPLE bond \to 1 σ bond and 2 π bond$ $"Each TRIPLE bond"->1 sigma " bond" and 2 pi " bond"$

Using this Rule we have here

$N O_{2} \to 2 σ and 1 π b o n d$ $NO_2->2sigma and 1pi bond$

$O_{2} \to 1 σ and 1 π b o n d$ $O_2->1sigma and 1pi bond$

$C_{2} H_{6} \to 7 σ and 0 π b o n d$ $C_2H_6->7sigma and "0 "pi bond$