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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques1 Mark
MCQ
Identify the correct statement.
  • A
    Reaction mechanisms are studied using isotopic labelling.
  • B
    Isolation of reactive intermediates is a method to establish reaction mechanism.
  • ✓
    Both $a$ and $b$ are correct.
  • D
    Neither $a$ nor $b$ is correct.
✓

Answer

Correct option: C.
Both $a$ and $b$ are correct.
Both $a$ and $b$ are correct.
  1. Reaction mechanisms are studied using isotopic labeling. One of the atoms of one reactant/ reagent is replaced with its isotope. Then, the product in which this labelled atom is present is determined. From this information, we can decide which atom of reactant goes to which product.
$\ce{CH_3​−CO−O*H + CH_3​−OH \xrightarrow{\text{H}^+} ​CH_3​−COO−CH_3​ + H_2O}*$​
In the above reaction, O atom of $−\ce{OH}$ group of acetic acid is labelled. It is then observed that labelled $O$ atom is found in water. Hence, we can conclude that
$−\ce{OH}$ group of acetic acid combines with $H$ atom of methanol.
  1. Isolation of reactive intermediates is a method to establish reaction mechanism.
Consider the conversion $A \rightarrow D.$
It can proceed through following two different mechanisms.
$A \rightarrow B \rightarrow D.$
$A \rightarrow C \rightarrow D.$
Suppose that we are able to isolate intermediate $B$ but we cannot isolate intermediate $C$.
​​​​​​​Hence, we can say that the reaction mechanism is $A \rightarrow B \rightarrow D.$

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