Question

Which of the following reactions is NOT an isodesmic reaction? Н,с-он "сн, CH4 + Hас -Он (А) + (В) ОН + ОН CI н н Н н н Br Br Br (C) + Br Br н Н Br Н Н (D) з СH4 2 Hа Select one: а. А b. В С. С d. D вооо

Please explain your answer

Answer 1

Isodesmic reaction:

The chemical reaction in which the type of chemical bonds broken are same as the type of bonds formed In products is called isodesmic reaction.

Example:

CH_​​​3^{​​​​-}​​​ + CH_​3​​​​-Br   -----> CH_{​​​​​4} + CH_{​​​​​3}^{​ -}

Here, the reactions (A), (B) and (C) are isodesmic reaction.

In these three reactions the type of chemical bonds broken are same as the type of bonds formed In products so these are isodesmic.

In reaction D the type of chemical bonds broken are not same as the type of bonds formed In products. So it is not an isodesmic reaction.

Hence the correct option is (d). D

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