NEW DELHI: The police officer handpicked by Arvind Kejriwal to head Delhi's anti-corruption unit has refused to take up the job, dealing a blow, at least temporarily, to the chief minister's promise to launch immediate probes into graft allegations. Praveer Ranjan , a 1993-batch IPS officer from the Arunachal Pradesh-Goa-Mizoram-Union Territories cadre, has also requested the Union home ministry to relieve him from the Delhi Police so that he can move to Puducherry as inspector general of police under a transfer order the ministry had issued last month. The ministry accepted the request on Friday morning."Praveer Ranjan gave in writing his unwillingness to take up the assignment at the anti-corruption branch (ACB)...there were never any orders issued posting him there (at the ACB) either," Home Ministry Joint Secretary (Union Territory) IS Chahal told ET. The order transferring Ranjan to Puducherry was issued three days before Kejriwal took over as chief minister. Ranjan, who was with the Economic Offences Wing of the Delhi Police, wasn't available for comment on Friday.The unwillingness of Ranjan to take up the job at ACB was communicated by Delhi Lieutenant Governor Najeeb Jung to Kejriwal when the chief minister met him on Thursday morning, home ministry sources said.According to two senior home ministry officials, there are a number of police officers who are unwilling to be posted at the ACB due to what they said the chief minister's "unrealistic expectations" on conducting speedy probes into a huge number of corruption cases.Former Delhi Police Commissioner BK Gupta also expressed a similar view. "I believe police officers do not want to join ACB right now," he told ET.Kejriwal made the demand to post Ranjan as the ACB chief during a meeting with Home Minister Sushil Kumar Shinde on February 17. Shinde and Home Secretary Anil Goswami had agreed to examine the demand.