Rank the compounds in each group in order of increasing...

Rank the compounds in each group in order of increasing reactivity in electrophilic aromatic substitution. a. C$_5$H$_5$NO$_2$, C$_5$H$_5$, C$_5$H$_5$OH b. C$_5$H$_5$, C$_5$HsCI, C$_5$HsCHO c. C$_5$H$_5$, C$_5$H$_5$NO$_2$, C$_5$H$_5$NH$_2$ d. C$_5$H$_5$CH$_3$, C$_5$H$_5$NH$_2$, C$_5$H$_5$CH$_2$NH$_2$

Rank the compounds in each group in order of increasing reactivity in electrophilic aromatic substitution.
a. C$_5$H$_5$NO$_2$, C$_5$H$_5$, C$_5$H$_5$OH
b. C$_5$H$_5$, C$_5$HsCI, C$_5$HsCHO
c. C$_5$H$_5$, C$_5$H$_5$NO$_2$, C$_5$H$_5$NH$_2$
d. C$_5$H$_5$CH$_3$, C$_5$H$_5$NH$_2$, C$_5$H$_5$CH$_2$NH$_2$

Transcript

00:01 Here the question is rank the compounds in each group in the order of increasing reactivity in electrophilic aromatic substitution.

00:14 So we have to rank all these compounds which are given according to increasing order of their reactivity for electrophilic aromatic substitution.

00:26 Now what is the important thing required for the electrophilic substitution? for electrophilic substitution, the electron density should be more in the benzene ring.

00:41 So if electron donating group is present in the benzene link, like suppose nh2 group is present.

01:04 In the nh2 group we have two loan pair, one loan pair is present and that can be donated to the benzene link.

01:15 So here this electron is going to increase the electron density in the benzene link at particularly ortho and paraposition and because of that it is activated for the electrophilic aromatic substitution at ortho and paraposition.

01:42 But if electron withdrawing groups are present in the benzene ring, then they are decreasing the electron density in the benzene ring and by that deactivates the benzene ring for electrophilic substitution.

02:08 So here if the nitrogen is present here with oxygen, we are taking the example of electron withdrawing group, nitro group and by this what happens the electrons are taken out from the benzene engine like this one electron is shifted here and the positive charge appears here electron is shifted here and the positive charge will be here and electron is shifted here and in this case it is the negative charge which appears at the ortho and periposition which is clearly indicating that electron density is increasing when electron donating groups are present in the molecule and it is true also because it stabilizes electron donating groups are stabilizing the intermediate carbocat ions by giving the whereas these intermediate carbocetions are destabilized by the electron withdrawing groups.

03:35 So accordingly we can arrange all the molecules which are given for the a...

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