If the question is in what sentence do you see a predicate adjective, then the correct answer is in the first one - Not all deserts are sweltering, where the word <em>sweltering </em>is a predicate adjective.
A predicate adjective is an adjective that can be found following a verb.
I think the sentence that uses it correctly is the last one.
Answer:
When a carboxylic acid is treated with an alcohol and an acid catalyst, an ester is formed (along with water). This reaction is called the Fischer esterification. ... The alcohol is generally used as solvent so is present in large excess. i hope this helps! if it didn't please comment under me :)
Explanation:
