tables are,

create table ABC 
   (I_NO Number(20), 
    Q_DOC Varchar2(10), 
    QSTN CLOB);
create table XYZ 
   (I_NO Number(20), 
    Q_DOC Varchar2(10), 
    QSTN CLOB, 
    ANSWER CLOB, 
    RESULT char(1));

trigger code is,

CREATE OR REPLACE TRIGGER A_Z 
   AFTER INSERT OR UPDATE ON ABC
   FOR EACH ROW
   BEGIN
      IF INSERTING THEN
           INSERT INTO Q_DYN (I_NO, Q_DOC, QSTN)
           VALUES (:NEW.I_NO, :NEW.Q_DOC, :NEW.QSTN);
      ELSIF UPDATING THEN
           UPDATE Q_DYN
           SET Q_DOC = :NEW.Q_DOC,
               QSTN= :NEW.QSTN
               WHERE I_NO = :OLD.I_NO;
        END IF;
    END;