Compound A(C10H6) liberates 2 mole of CH4 when treated with MeMgBr. On heating with KMnO4 solution, “A” produces benzene dicarboxylic acid which on mononitration produces only one product and no other isomers. The compound “A” can be:
"A” Contains two acidic hydrogen which upon reacting with KMnO4 gives terephthalic acid which on mononitration gives only one product which is given below.