Windows :: Batch File Versus SQL Developer

I have a particular sql code which works perfectly fine on sql developer. But if I run the same sql code through a batch file it does not get executed. It does not throw an error too.

SQL code - clean_tables.sql

begin
execute immediate 'drop table external_tables';
execute immediate 'drop table security';
exception
when others then
null;
end;

Batch file - Clean.bat

set ORACLE_SID=orcl
set ORACLE_HOME=C:oracleproduct11.2.0dbhome_1
set PATH=C:oracleproduct11.2.0dbhome_1BIN

sqlplus security/password@orcl <c:Reportclean_tables.sql

pause