VerifiedHint: We know that the organic compounds were represented using structural formulas. To draw the three dimensional structure of a compound, one can use wedge-dash representation.
Complete answer:
Now we can discuss about the Wedge-Dash notation as,
In Wedge-Dash notation the bond which protrudes above the plane of paper or towards the viewer is denoted by a solid wedge while that project far away from the viewer or below the plane of the paper is denoted by a dashed wedge and therefore the bond within the plane of the paper is represented by a line.
Now we can see example for this concept, the structure of methane is given below as,
In the structure of methane, the four hydrogen atoms are linked with carbon by tetragonal arrangement.
Therefore, from the above explanation it is clear that option A is correct.
Note: We need to remember that even if a compound has just one molecular formula, structurally it is represented in numerous ways. There are three more structural formulas other than wedge-dash representation and they are:
1. The Complete Structural Formula illustrates every single bond formed between every atom within the compound.
2. Condensed Structural Formula is the formula in which some bonds are replaced by a variety of identical groups attached to an atom by a subscript.
3. Bond Line Structural Formula: A bond line molecular formula is different from the structural representation of organic compounds. Here, every bond is represented as a line during a zigzag manner.