Why secondary and tertiary alcohol react with halogen acid by sn1 and and primary alcohol react with halogen acid by sn2

please ask if any doubt

although we say that more the stability lessee will be reactivity but in case of alcohol tertiary is more stable so it should be least reactive n??

but in book it is given that it is more reactive

see this page

for stability we generally consider thermodynamic stability...Tertiary carbocations are stable by inductive effect and hyper conjugation, and therefore have the tendency to sustain the positive charge on the carbon atom and stay like this for long. That is why we call it stable: it can stay that way longer.

kinetic theory suggests that tertiary carbocation are most reactive too

Kinetic theory illustrates that the reactants present in the container randomly move in a container without any energy loss. Now imagine that there is a carbocation that is not so stable (take n-butane carbocation as an example) and now if a nucleophile would want to attack the cation, how could it attack it if it is not able to hold up by itself? The cation must hold on to itself in order to let the nucleophile come to it and then attack it. Tertiary carbocations have the stability to hold up like that and allow the nucleophile to attack it.

now got this shweta?. Differentiate this by thermodynamic stability and kinetically reactivity

kinetic theory ik Baar dobara bta do

nucleophile achhe se attack karega ...jb intermediates achhe se positive charge ko hold karega...tertiary carbocation positive charge ko achhe se hold krke rakhte hai...then kinetically reactive hote hai or order 3>2>1 rhte hai...and thermodynamically to hote hi hai...so order remain same

any doubt?

sir plz wait

writing

although we say that more the stability lessee will be reactivity but in case of alcohol tertiary is more stable so it should be least reactive n??

m sending u the picture

this

same order will be just like i send

although we say that more the stability lessee will be reactivity but in case of alcohol tertiary is more stable so it should be least reactive n??

plz expalin this

yes wait I'm bit busy

No, shweta here we will check the stability of intermediate, more the stability more is the formation of intermediate so more will be the rate of reaction

ok

ok intermediate to carbocation he hai n

sir to. carbocation to tertiary stable hai mtb least reactive

yes

yes, 3° carbocation is most stable so SN1 takes place

bs itna yaad rkho ki jis reaction me intermediate carbocation bnta he, vha pr rate of reaction dekhne k liye stability dekho. jitan intermediate stable hoga rate of reaction utni hi jada hogi

ok sir thanku

FIR ek ho Jo concept hai jis mein stability or reactivity inversely related hote hain vo to sahi hai n

yes