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The optical spectroscopic and radio interferometric HI 21 cm-lineobservations of the blue compact dwarf galaxy Mrk 22 are presented. TheWolf-Rayet (WR) emission line features corresponding to high ionization linesof HeII $\lambda$4686 and CIV $\lambda$5808 from young massive stars aredetected. The ages of two prominent star forming regions in the galaxy areestimated as $\sim$10 Myr and $\sim$ 4 Myr. The galaxy has non-thermal radiodeficiency, which also indicates a young star-burst and lack of supernovaeevents from the current star formation activities, consistent with thedetection of WR emission lines features. A significant N/O enrichment is seenin the fainter star forming region. The gas-phase metallicities [12 + log(O/H)]for the bright and faint regions are estimated as 7.98$\pm$0.07 and7.46$\pm$0.09 respectively. The galaxy has a large diffuse HI envelop. The HIimages reveal disturbed gas kinematics and HI clouds outside the optical extentof the galaxy, indicating recent tidal interaction or merger in the system. Theresults strongly indicate that Mrk 22 is undergoing a chemical andmorphological evolution due to ongoing star formation, most likely triggered bya merger.

Tidal interaction, star formation and chemical evolution in blue compact dwarf galaxy Mrk 22