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  1. Among the following compounds the one that is most reactive towards electrophilic
  2. The four bonds in methane are directed in space with an angle of
  3. In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode
  4. In Duma’s method for estimation of nitrogen, 0.25g of an organic compound
  5. Galena is an ore of