Dark-violet colour appears, when FeCl3 solution is added to the following substance:

Answer options

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2. {# "img":"yb2sm14fx5xn9aqadfk99q74v.png", "alt":"Option","whb":"72:105:" #}
3. {# "img":"p2k4nax7oqxw7erm7zyfvhrtm.png", "alt":"Option","whb":"180:127:" #}
4. {# "img":"wtdanpc1ru5uowqr7jzf022pf.png", "alt":"Option","whb":"87:102:" #}
5. {# "img":"gqlsgw1nrswelvr4kdi4cibsp.png", "alt":"Option","whb":"105:115:" #}