Azo dye from diazotised sulphanilic acid and 1-naphthylamine: its structure or mass

1. A.
   1,5-bis[(4-sulphophenyl)diazenyl]naphthalene (no amino group retained)
2. B.
   4-[[4-amino-5-[(...)diazenyl]naphthalen-1-yl]diazenyl]naphthalene-1,5-disulphonic acid (a bis-azo naphthalenedisulphonic acid)
3. C.
   5-[(4-sulphophenyl)diazenyl]naphthalen-1-amine (azo group and $-NH_2$ on different rings, 1,5)
4. D.
   4-[(4-sulphophenyl)diazenyl]naphthalen-1-amine (azo group para to $-NH_2$ on the same ring, 1,4)

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1. A.
   343
2. B.
   330
3. C.
   33
4. D.
   66

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