Write the names of the following compounds.

The first member of alkyne homologous series is

Draw the electron dot structure of ethyne and also draw its structural formula.

Identify and name the functional groups present in the following compounds.

A compound X is formed by the reaction of a carboxylic acid C₂H₄O₂ and an alcohol in presence of a few drops of H₂SO₄. The alcohol on oxidation with alkaline KMnO₄ followed by acidification gives the same carboxylic acid as used in this reaction. Give the names and structures of (a) carboxylic acid, (b) alcohol and (c) the compound X. Also write the reaction.