Create table test (
                   state_name varchar2(20)
  );

  insert into test (State_name)
              values ('Jammu & Kashmir');

then output come: give & Kashmir Value:

While Jammu & Kashmir is a single state name, then please let me know that how to insert values (Jammu & Kashmir)

where I want output like:
select * from test;
State_name
-----------
Jammu & Kashmir

SQL> Create table test (
                   state_name varchar2(20)
  );  2    3  

Table created.

SQL> insert into test (State_name)
              values ('Jammu & Kashmir');
  2  
1 row created.

SQL> commit;

Commit complete.

SQL> select * from test;

STATE_NAME
--------------------
Jammu & Kashmir

SET DEFINE OFF

SQL> set define off
SQL> drop table test purge;

Table dropped.

SQL> Create table test (
  2                     state_name varchar2(20)
  3    );

Table created.

SQL>
SQL>   INSERT INTO TEST (State_name)
  2                values ('Jammu & Kashmir');

1 row created.

SQL> select * from test;

STATE_NAME
--------------------
Jammu & Kashmir

SQL>