The notices were served by state BJP president VD Sharma on former minister Gauri Shankar Shejwar and his son Mudit Shejwar, and exlegislator Gajraj Singh Sikarwar.
While Pungro-Kiphire seat in Nagaland saw the highest voting of 89.8 per cent, the turnout was the poorest in Rajarajeshwari Nagar in Karnataka at 39.15 per cent.
The Madhya Pradesh government was directed to cancel transfer orders of 12 joint and deputy collectors which were issued after the MCC came into effect ahead of the bypolls.
Besides Chouhan and Scindia, Union ministers Narendra Singh Tomar, Thawar Chand Gehlot and former chief minister Uma Bharti also figure in the star campaigners' list.
Madhya Pradesh BJP president Vishnu Dutt Sharma said his party will win all the 28 assembly seats going to the bypolls on November 3.