Write structures of compounds A, B and C in each of the following reactions :
`CH_(3)CN underset((b)H_(3)O^(+))overset((a)SNCl_(2)//HCl) to A overset("dil. NaOH")toB overset(Delta)to C `

Write structures of compounds A,B and C in each of the following reactions: (i) C_(6)H_(5) Br overset("Mg/dry ether")rarr A underset((b)H_(3)O^(+))overset((a) CO_(2)(g))rarr B overset(PCl_(5))rarr C (ii) CH_(3)CN underset((b) H_(3)O^(+))overset((a) SnCl_(2)//HCl)rarr A overset("dil."NaOH)rarr B overset(Delta)rarr C

Write the structures of compounds A, B and Cin the following reactions: (a) CH_(3) - COOH overset(NH_(3) // Delta)(to) A overset(Br_(2) // KOH(aq))(to) B overset(CHCl_(3) + alc. KOH)(to) C (b) C_(6)H_(5)N_(2)^(+)BF_(4)^(-) underset(Delta)overset(NaNO_(2) // Cu)(to) A overset(Fe // HCl)(to) B overset(CH_(3)COCl // "pyridine")(to) C