The structure of crystal violet and \"arrow-pushing\" for the reaction with OH a

Question

The structure of crystal violet and "arrow-pushing" for the reaction with OH are shown below Ignoring any effects of solvation of the ions, explain whether the reaction is likely to be exothermic or endothermic Consider the reaction of hydroxide ion with dimethylether shown below, which has an activation energy of 82 kJ/mol. Compare this value with the activation energy you obtained in the crystal violet experiment and provide an explanation for why the values are, or are not, different. a. b. Ea 82 kJ/mol OH H3CO CH3 CH3O H3C-OH

Explanation / Answer

a)

Here crystal violet is (+) charged and OH- is negative charged species.

IN the forward reaction one sigma bond (C-O) formed.

Hence during this bond energy is released. so it is exothermic reaction.

b)

Here one C-O bond break during nuclephilic attack of OH- and one C-O bond is formed.

we know, during bond breaking energy is required and during bond making energy is released.

In case of crstal violet no bond breaking occurs but one C-O bond formed.

so activation energy of crstal violet reaction is less than reaction of OH- and diethyl ether.

so in both case activation energy are different.

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