An organic compound \([A](\mathrm{C_4H_{11}N})\), shows optical activity and gives \( \mathrm{N_2} \) gas on treatment with \( \mathrm{HNO_2} \). The compound \([A]\) reacts with \( \mathrm{PhSO_2Cl} \) producing a compound which is soluble in \( \mathrm{KOH} \). The structure of \( A \) is:
