question_answer

Total number of optically active compounds from the following list is \[{{C}_{2}}{{H}_{5}}NHC{{H}_{3}}\], \[C{{H}_{3}}C{{H}_{2}}CH\left( C{{H}_{3}} \right)N\left( C{{H}_{3}} \right){{C}_{2}}{{H}_{5}}\], \[\left[ Ph\left( C{{H}_{3}} \right)\left( {{C}_{2}}{{H}_{5}} \right)\overset{+}{\mathop{N}}\,H \right]{{I}^{-}}\] \[\left[ {{\left( C{{H}_{3}} \right)}_{2}}\left( {{C}_{2}}{{H}_{5}} \right)\overset{+}{\mathop{N}}\,H \right]{{I}^{-}}\], \[{{C}_{6}}{{H}_{5}}\left( C{{H}_{3}} \right)\left( {{C}_{2}}{{H}_{5}} \right)\overset{+}{\mathop{N}}\,-{{O}^{-}}\], \[\left( C{{H}_{3}} \right)\left( {{C}_{2}}{{H}_{5}} \right)NCH{{\left( C{{H}_{3}} \right)}_{2}}\]

Answer:

3.00