Identify the following terms / compounds :

Identify the following terms / compounds:

(a) A compound which reacts with water to give acetylene gas.

(b) The gas evolved when sodium propanoate is heated with soda lime.

(c) A reddish-brown precipitate formed when ferric chloride solution reacts with an alkali.

(d) A pair of electrons present in an atom which is not shared with any other atom during bond formation.

(e) The relative molecular mass of a substance expressed in grams.