Export of audio file

i have exported my audio file,though i selected it mpeg format ,in the export folder it is showing as wave file, i need to share it to my friend for hearing on email…can someone help…

Sounds like you imported the file back into the Pool or already have similar / duplicate file name.

Suggest you do the export again and set the file export location to somewhere unique like Desktop.
Select mp3 as the file type (or WAV if you need it)
To send to your friend, upload to https://wetransfer.com/ to get a link which you can then pass to him/her. (Much better than trying to email or whataspp a physical file, which is very bad etiquette, unless they request it that way).