Surprisingly, All other programs are working fine with rclone mounts viz abiword, xed, geany etc.I searched a lot and found solutions like using a .xcd file to remove file locking but it did not work.
(webpage link: https://askubuntu.com/questions/553824/how-to-disable-locking-in-libreoffice)
echo '<?xml version="1.0" encoding="UTF-8"?> false
' |sudo tee /usr/lib/libreoffice/share/registry/disable-file-locking.xcd
Am looking for a solution to be able to work upon my files on rclone mounts.