Unable to generate single byte character when used TO_SINGLE_BYTE

Hi All,
Can anyone help me in getting the output for the below single byte query. When tried it says INVALID NUMBER.
Step 1 :-
select RAWTOHEX('2Z') from DUAL; -- 325A
Step 2:-
SELECT TO_SINGLE_BYTE(CHR('325A')) FROM DUAL;
The above query when executed it says "ORA-01722: invalid number".
I tried using VARCHAR2 instead of CHR it throuws the below exception,
"ORA-00936: missing expression".
But the same query if no characters are passed is working fine.
SELECT TO_SINGLE_BYTE(CHR('3251')) FROM DUAL;
Thanks,
Ravi

TO_SINGLE_BYTE is used to convert multi-byte characters to single-byte characters. '325A' is not a multi-byte character so can't be converted.
Use HEXTORAW to convert the hex value back to a raw value.

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    *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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