Venkat,
To impose penalty or not is the discretionary power of Ao is not correct. The AO will have to record reasons for initiating penalty proceedings, he must have reasonable ground for imposing the same. However, ignorance of law cannot be an excuse for non imposition of penalty. I advise you to take stand that the entire proceeding is vitiated by an invalid notice.
Your second query whether he is expecting a bribe cannot be answered because I am not sure who is the AO dealing with the case. In any case there must be some expectation from you in return for any favour from his side.