Question

indicate sigma and pi bond in CH3CH8

Answer 1

Usually, all bonds between atoms in most organic compounds contain one sigma bond each. If it is a single bond, it contains only sigma bond. Multiple bonds (double and triple), however, contains sigma and pi bonds. Double bonds have one each, and triple bonds have one sigma bond and two pi bonds.

1 single bond = 1 sigma bond

1 double bond = 1 sigma bond + 1 pi bond

1 triple bond = 1 sigma bond + 2 pi bonds

So, you’ll get that:

#sigma bonds = #single bonds + #double bonds + #triple bonds

#pi bonds = #double bonds + 2 * #triple bonds

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