1993 jee

Fro arihant 30 years solutions

True /False
Q photobromination of 2methyl propane gives mixtuere of 1bromo 2 methyl propane and 2 bromo methyl propane in ratio 9:1

Ans False

Explaination:Ratio of 2 products is determined by this formula
1bromo 2 methyl propane No. of 1° H * Reactivity of 1° H
____________________ =__________________________
2 bromo methyl propane No. of 2° H * Reactivity of 2° H

my doubt..........do we need to remeber this formula??????????[7][7][7]

18 Answers

24
eureka123 ·

lo ek aur formula........[3][3]..main yahan formula se bachne ki soch raha hoon aur tu ek aur bata raha hai.....[9]

24
eureka123 ·

thanx sir..[1]

1
gagar.iitk ·

i dont think u have to remember the formulae but u should know the trick behind it
and this reactivity ratios depends upon the temperature also so there is no need to mug up the values but u should know the relative reactivity and i think that will do

39
Dr.House ·

your wish, but ya yeh jaise usne kaha gk hain. mostly people know this. its given everywhere.

11
Subash ·

i dont think theres a need to remeber the ratio

24
eureka123 ·

main bhi samjh raha hoon uski bhavna........par ratio yaad karne se kaam nahin banega......[2][2]

39
Dr.House ·

sid means selectivity of bromine

24
eureka123 ·

mujhe bhi samajh nahin aaya................aise to hazar ratio yaad karne padenge...........[3][3][3]

1
Philip Calvert ·

[11] ye kya 1:82:1600 [7][7]

3
msp ·

yes . i think this is the only one formula to be remembered in the chapter alkanes.

1
sidsgr88 Bora ·

this is not a formula.....its just what u call GK ........
n u shud no dat reactivity is 1:82:1600

33
Abhishek Priyam ·

Gr8 shubhas...

JEE always gives an escape for non formula based students... [3]

11
Subash ·

so ratio is wrong evidently

11
Subash ·

well if u know the principle

then bromination is less reactive and more selective

so ratio should favour the more selective product since itz true or false exact values not required

3
msp ·

ask ne chem genius like sri,abi,sky and bhaiyyas

1
big looser ......... ·

u have to remember

24
eureka123 ·

ok........but how to attempt it without formula?????i mean to say is there any other crude method to predict this ratio...not exactly but around the same value?[7][7][7]

11
Subash ·

not exactly but well yes

but the selectivity reactivity principle should be remembered

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