Indicate the `sigma-` and `pi -` bonds in the following molecules:
I. `C_(6) H_(6)` II. `C_(6) H_(12)` III. `CH_(2) CI_(2)`
IV. `CH_(2) = C = CH_(2)` V. `CH_(3) NO_(2)`
VI. `HCONHCH_(3)`

Explanation

(i) `C_(6)H_(6)`

There are six C–C sigma `(sigma_(C-C))`bonds, six C–H sigma `(sigma_(C-H))` bonds, and three C=C pi `(pi_(C-C))` resonating bonds in the given compound.
(ii) `C_(6)H_(12)`

There are six C–C sigma `(sigma_(C-C))` bonds and twelve C–H sigma `(sigma_(C-H))` bonds in the given compound.
(iii) `CH_(2)Cl_(2)`

There two C–H sigma `(sigma_(C-H))`bonds and two C–Cl sigma `(sigma_(C-Cl))` bonds in the given compound.
(iv) `CH_(2)=C=CH_(2)`

There are two C–C sigma `(sigma_(C-C))` bonds, four C–H sigma `(sigma_(C-H))` bonds, and two C=C pi `(pi_(C-C))` bonds in the given compound.
(v) `CH_(3)NO_(2)`

There are three C–H sigma `(sigma_(C-H))` bonds, one C–N sigma `(sigma_(C-N))` bond, one N–O sigma `(sigma_(N-O))` bond, and one N=O pi `(pi_(N-O))` bond in the given compound.
(vi) `HCONHCH_(3)`
`H-overset(O)overset(||)C-overset(H)overset(|)N-underset(H)underset(|)overset(H)overset(|)C-H`
There are two C–N sigma `(sigma_(C-N))` bonds, four C–H sigma `(sigma_(C-H))` bonds, one N–H sigma bond, and one C=O pi `(pi_(C-C))` bond in the given compound.`