Question

total sigma bonds in ethane?

Answer 1

Sigma bond: A covalent bond resulting from the formation of a molecular orbital by the end-to-end overlap of atomic orbitals, denoted by the symbol σ.

Note: A single bond such as (C-H) has one sigma bond whereas a double (C=C) and triple (C≡C) bond has one sigma bond with remaining being pi bonds.

Bond type	No. of σ bond	No. of π bonds
Single (C-H)	1	0
Double (C=C)	1	1
Triple (C≡C)	1	2

Now, we see the orbital diagram of Ethane

Hence total sigma bonds in Ethane is 7 (seven)