To identify the word with a prefix in the given options, we need to understand what a prefix is. A prefix is a group of letters added at the beginning of a word to change its meaning.
Let's look at the words given:
i) unity
ii) under
iii) union
iv) unfair
Out of the four options, the word "unfair" has a prefix. The prefix "un-" has been added to the word "fair" to change its meaning. In this case, "un-" acts as a negative prefix, turning the word "fair" into its opposite, "unfair."
Therefore, the word "unfair" from the given options has a prefix, which is "un-."
