A compound A has molecular formula C₇H₇NO. On treatment with Br₂ and KOH, A gives an amine B which gives carbylamine test. B upon diazotization and coupling with phenol gives an azo dye. A can be :
A. C6H5CONH₂
B. C6H5NO2
C. C6H5CONHCOCH3
D. o, morp-CH(NH2) CHO