Answer
64.8k+ views
Hint: Basicity can be referred to as "electron pair instability", and this electron pair instability increases as the charge density on the aniline increases. This means that the basicity should or does increase with the increased negative charge on the group.
Complete answer:
Now we know that basicity increases with the charge density on the group, therefore, we can say that a conjugate base of an amine always be stronger than the amine itself. This relationship between the lower basicity due to the lower charge densities also applies to the lone pairs that are being localised into a larger pi system through resonance.
Thus, we can say that the stronger the acid, the weaker the conjugate base or vice versa.
* In case of the given question, if an electron withdrawing group is attached to amine like ${C}_{6}{H}_{5}$- groups, they decrease the electron density on the nitrogen atom hence decreasing the basicity.
* Further, the effect of an electron withdrawing group like, $N{O}_{2}$, $CN$, $C{H}_{3}$, near to a basic center decreases the basicity due to the electron withdrawing inductive effect.
* Now, among the groups $N{O}_{2}$, $CN$, $C{H}_{3}$, $C{H}_{3}$ has the least electron withdrawing capacity and hence has more basic strength than $N{O}_{2}$, $CN$.
* Among $N{O}_{2}$, $CN$, $N{O}_{2}$ has more electron withdrawing capacity than $CN$, but it also shows resonance in its structure which provides stabilization hereby decreasing the basicity. Thus, $CN$ has more basic strength than $N{O}_{2}$.
Therefore, the correct order of the basic strength is IV>I>III>II. Hence (c) is the correct answer
Note: When a nitro group is present at the o or p-positions then the electron withdrawal is increased for the interaction of the unshared pair electron of nitrogen in the amino group with the benzene nucleus having delocalised p orbital.
Complete answer:
Now we know that basicity increases with the charge density on the group, therefore, we can say that a conjugate base of an amine always be stronger than the amine itself. This relationship between the lower basicity due to the lower charge densities also applies to the lone pairs that are being localised into a larger pi system through resonance.
Thus, we can say that the stronger the acid, the weaker the conjugate base or vice versa.
* In case of the given question, if an electron withdrawing group is attached to amine like ${C}_{6}{H}_{5}$- groups, they decrease the electron density on the nitrogen atom hence decreasing the basicity.
* Further, the effect of an electron withdrawing group like, $N{O}_{2}$, $CN$, $C{H}_{3}$, near to a basic center decreases the basicity due to the electron withdrawing inductive effect.
* Now, among the groups $N{O}_{2}$, $CN$, $C{H}_{3}$, $C{H}_{3}$ has the least electron withdrawing capacity and hence has more basic strength than $N{O}_{2}$, $CN$.
* Among $N{O}_{2}$, $CN$, $N{O}_{2}$ has more electron withdrawing capacity than $CN$, but it also shows resonance in its structure which provides stabilization hereby decreasing the basicity. Thus, $CN$ has more basic strength than $N{O}_{2}$.
Therefore, the correct order of the basic strength is IV>I>III>II. Hence (c) is the correct answer
Note: When a nitro group is present at the o or p-positions then the electron withdrawal is increased for the interaction of the unshared pair electron of nitrogen in the amino group with the benzene nucleus having delocalised p orbital.
Recently Updated Pages
Write a composition in approximately 450 500 words class 10 english JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Arrange the sentences P Q R between S1 and S5 such class 10 english JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What is the common property of the oxides CONO and class 10 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What happens when dilute hydrochloric acid is added class 10 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
If four points A63B 35C4 2 and Dx3x are given in such class 10 maths JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
The area of square inscribed in a circle of diameter class 10 maths JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Other Pages
A boat takes 2 hours to go 8 km and come back to a class 11 physics JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
In the ground state an element has 13 electrons in class 11 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Electric field due to uniformly charged sphere class 12 physics JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
According to classical free electron theory A There class 11 physics JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Excluding stoppages the speed of a bus is 54 kmph and class 11 maths JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)