Which of the following is/are representations of wedge-dash form(s) of methane?
Both a & b
In the wedge and dash form, we represent the 3-dimensional structures of the molecule(s) on paper. Usually, 2 bonds are represented to lie on the plane of the paper. A third bond is depicted by using a wedge or . The bond that this wedge represents comes out of the plane of the paper. The fourth is depicted using a dash that signifies that this particular bond goes into/beneath the plane of the paper.
Methane has sp3 hybridization and is of tetrahedral geometry. Both (a) ad (b) are correct wedge-dash representations of methane.