List of top Chemistry Questions on electron displacement effects asked in JEE Main

Three different reactions were started with identical initial concentration of reactants. Which of the following statement is correct regarding the given graph showing variation of reactant concentration with time?
Increasing order of electron withdrawing power of following functional groups is:
a. -CN
b. -COOH
c. -NO₂
d. -I

Given below are two statements: 
Statement I: The conversion proceeds well in a less polar medium. \[ {CH}_3{CH}_2{CH}_2{CH}_2{Cl} \xrightarrow{{HO}^-} {CH}_3{CH}_2{CH}_2{CH}_2{OH} + {Cl}^- \] Statement II: The conversion proceeds well in a more polar medium. \[ {CH}_3{CH}_2{CH}_2{CH}_2{Cl} \xrightarrow{{R}_3{N}} {CH}_3{CH}_2{CH}_2{CH}_2{NH}_2 + {Cl}^- \] In the light of the above statements, choose the correct answer from the options given below:

In alkaline medium, the reduction of permanganate anion involves a gain of _____ electrons.
The correct order of electron gain enthalpies of Cl, F, Te and Po is
If de- Broglie wavelength of electron is equal to de- Broglie wavelength of proton, then what is the relation between their kinetic energy