00:01
Okay, so we have given here the some electrophiles and we have to circle the one which will give the s -n2 reaction at very best.
00:13
Okay, so we have ch3i.
00:19
We have this alkyl iodide and this one.
00:27
Okay, so it is to be noted that reactivity for, for sn2 so that will be greater for methyl halide than one degree halide then two degree halide and least for three degree halide okay so that's why the correct answer is this one okay so i hope you know that this one the carbon dilettis2 iron group this carbon consists of only one alkylchyl group so that's why it is a one degree halide and we have here this carbon attached to two different carbon atom to same halide same alkyl groups actually okay this carbon directly test to iodine this is attached to two same alkali group and this is we have secondary right so now b part so we have given oxygen sulfur double bonded layer attached to oxygen to oxygen atom and methyl group and we have oxygen sulfur then double bondedly oxygen atom ch2f and oxygen sulfur two double bonded oxygen atom chf2 okay so now see see in the question we have given that we have to select the most reactive electrophile for sn2 okay so electrophiles are what electron deficient species right and why are we considering electrophile because this is about sn2 reaction this is a nucleophilic substitution nucleophilion is the substitution of nucleophile the electron rich species over the electron deficient uh or i should say on the electron deficient atom or the carbon so we have to consider here that which of the species is most electron deficient.
03:17
So here we consider see this whole part, this whole part is same, only the difference is between ch3, ch2f2, okay? so here you can see that carbon is directly as to 3 hydrogen atom, right? can i draw it again? so we have carbon with three hydrogen atom.
03:47
We have carbon with two hydrogen, one fluorine.
03:52
We have carbon with one hydrogen, two fluorine atom.
03:59
So now see, fluorine is the electronegative atom.
04:04
Being electronegative, it has tendency to withdraw the electron density towards itself.
04:09
Okay? bond pair of electron towards itself.
04:11
And this is the reason why this is this fluorine directly at times to carbon...