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OK. First: Please use CODE tags when submitting code and please use indentation that shows the structure of your code. For example, with code tags and indentation to show grouping, your sample code...

you would use

gzip -S .1.gz /var/log/mrnet.log

But from the filepath and name you really should setup a logrotate entry as /etc/logrotate.d/mrnet something like this

/var/log/mrnet.log
{...

What exact command did you use?
ex.:
zip newzipfilename.zip /var/log/mylog.log

if [ $(stat --printf="%s" mylogfile.log ) -gt 5000 ]
then
echo "File size is greater than 5000"
else
echo "File size is lesser than 5000"
fi

find mylogfile.log -size +5K -exec echo 'file larger than 5k' \;

tar is an archiving utility. You can check the manual pages here (https://www.unix.com/man-page/linux/1/tar/) for further reference.

tar is an archiver somewhat like zip, older and not tied to the archive file so closely, not doing updates, deletions and such that zip does.

Usually, zip needs a zip archive file to save to. For compressed content, zip just copies, so there is no waste. Generally, compressing twice makes a third file bigger than the second.

You can...

I don't think repeated compression is a good idea. It can lead to file corruption.

I suggest to tar the file first and then apply a bzip2 compression on top of that.
tar myfilelog.log.tar...

If you want to move only the first .gz file based on modification time, then you can use ls command with -t option:
for i in $( ls -t *.gz | tr " " "\n" | head -1 )
do
echo "Moving file: ${i}"...

What have you tried so far? Where are you stuck?

To move gz files in old-logs directory to new-logs directory one-by-one:-
for in in *.gz
do
echo "Moving file: ${i}"
mv ${i} new-logs/
done
To move gz files in old-logs directory to...

There is a space that should not be there, but also you cannot use wild cards in combination with test -e like that... Try:
exists() {
[ -e "$1" ]
}

if exists /var/log/*.gz ; then
echo...