There is a mistake in one one step of the mechanism shown below. In one place the use of a curly arrow is incorrect - which is wrong? H-OH2 OH OH OH Me `OEt Me OEt Me- OEt Me `OEt OH2 OH (b) (c) OH2 - ELOH + H3O* Me Me OH (d) О а. с O b. a Ос. d. O d. b

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