▁am mon ium ▁c ations ▁having ▁one ▁triple - b ond ed ▁substitution , ▁R ≡ N H + ▁nit ril ium , ▁RC ≡ N H + ▁( pro ton ated ▁nit rile ) ▁dia zon ium , ▁N ≡ N H + ▁( pro ton ated ▁nit ro gen ) ▁t ert i ary ▁am mon ium ▁c ations ▁having ▁two ▁partially ▁double - b ond ed ▁substitution s , ▁R N H + R ▁py rid in ium , ▁C 5 H 5 N H + ▁( pro ton ated ▁py rid ine ) ▁qu atern ary ▁am mon ium ▁c ations ▁having ▁one ▁triple - b ond ed ▁substitution ▁and ▁one ▁single - b ond ed ▁substitution , ▁R ≡ NR + ▁dia zon ium , ▁N ≡ NR + ▁( subst it uted ▁pro ton ated ▁nit ro gen ) ▁nit ril ium , ▁RC ≡ NR + ▁( subst it uted ▁pro ton ated ▁nit rile ) ▁t ert i ary ▁ox on ium ▁c ations ▁having ▁one ▁triple - b ond ed ▁substitution , ▁R ≡ O + ▁nit ro son ium , ▁N ≡ O + ▁t ert i ary ▁ox on ium ▁c ations ▁having ▁two ▁partially ▁double - b ond ed ▁substitution s , ▁RO + R ▁py ry li um , ▁C 5 H 5 O + ▁t ert i ary ▁sul fon ium ▁c ations ▁having ▁one ▁triple - b ond ed ▁substitution , ▁R ≡ S + ▁th ion it