Question

In wedged-dash notation for three-dimensional representation of an organic molecule, the dashed bond represents:

• A. A bond in the plane of the paper.
• B. A bond above the plane of the paper.
• C. A bond below the plane of the paper.
• D. A bond either below or above the plane of the paper.

Answer 1

The correct option is C

A bond below the plane of the paper.

Explanation for correct option:

Option (c) A bond below the plane of the paper.

Wedged-dash notation:

• In Wedge-Dash notation, a solid wedge represents a bond that protrudes above the plane of the paper or towards the viewer.
• A dashed wedge represents a bond that protrudes away from the viewer or below the plane of the paper.
• And a line represents a bond that is inside the plane of the paper.
• For example: In the Methane (${\mathrm{CH}}_4$) molecule, The dashed bond shows a bond is below the plane and the wedged shows that the bond is above the plane.

Explanation for incorrect options:

Option (a) A bond in the plane of the paper.

• This option is incorrect.
• Because the solid lines represent that the bonds are in the plane of the paper.

Option (b) A bond above the plane of the paper.

• A bond above the plane of paper is represented by The wedged line.
• So, this option is also incorrect.

Option (d) A bond either below or above the plane of the paper.

• The dashed line represents that the bond is below the plane of the paper.
• Hence, this option is also wrong.

Thus, option (c) is correct. The dashed bond represents a bond below the plane of the paper.