1. Are the above mentioned sentences correct?
2. Are the above sentences correct?
I believe both sentences are correct.
But my friend say that the first sentence is wrong. I couldn't believe it.
The text below is a clear example of the use of above-mentioned (a more formal adjective is aforementioned).
It comes from a definition of chiasmus (Chiasmus - Examples and Definition of Chasmus).
Notice that the writer makes the mistake of not using a hyphen in above-mentioned,
Let us try to understand chiasmus with the help of an example:
“Never let a Fool Kiss You or a Kiss Fool You.”
Notice that the second half of the above mentioned sentence is an inverted form of the first half both grammatically and logically.