(a) $CH_{3}CH_{2}I\overset{NaCN}{\rightarrow}CH_{3}CH_{2}CN\overset{OH^{-}}{\rightarrow}CH_{3}CH_{2}CONH_{2}\overset{Br_{2}/NaOH}{\rightarrow}CH_{3}CH_{2}NH_{2}$
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Ph.D. in Physics with 19+ years of teaching experience.