The deep red colouration is due to the formation of:

F e (C H_{3} C O O)

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F e (O H)_{2} C H_{3} C O O

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[F e_{3} (O H)_{2} (C H_{3} C O O)_{6}]^{+}

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[F e_{3} (C H_{3} C O O)_{6}]

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Solution

The correct option is B $[F e_{3} (O H)_{2} (C H_{3} C O O)_{6}]^{+}$
When added to neutral $F e C l_{3}$ , acetates produce a red coloration.
$F e C l_{3} + 3 C H_{3} C O O H \to (C H_{3} C O O)_{3} F e + 3 H C l$
In aqueous solution it forms $[F e_{3} (O H)_{2} (C H_{3} C O O)_{6}]^{+}$ .

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