Draw the electron dot structure of ethyne and also draw its structural formula.
(CBSE 2005)

Ethyne is an alkyne containing 2 carbon atoms which are connected by a triple bond. As carbon can have a maximum of 4 bonds around it (1 bond represents 2 shared electrons), the remaining one bond is satisfied by hydrogen atom.

Therefore, the electron dot structure looks like:

The structural formula can be drawn by replacing a pair of electrons by a short straight line or bond.

H—C≡C—H