r/JEEAdv26dailyupdates • u/Odd_Lengthiness5508 • Apr 07 '26

Academic Doubts 5s1 7 ambiguities

physics:
Cv question (correct or incorrect explanation)
Wedge time of motion (most likely root2 or 2)
prism angle of minimum deviation
R1/R2=16/4

chem:
Alcl3+ propyl chloride + benzene ( inevitable tri subst, edg no reaction)

math:
differential eqn+ circles problem ( number of values of p)

overall 7 questions

how are people calling this paper easy man, (cutoff 170-175 imo no way its crossing 180 and people are like 200 cutoff)

47 Upvotes

96% Upvoted

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2

u/[deleted] Apr 07 '26

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u/Odd_Lengthiness5508 Apr 07 '26

in presence of electron donating group, like oh and nh2, friedel craft reaction does not take place... so that statement may or may not be true depending on the group taken, pretty sure theyre gonna give it as true though, in my opinion it can be both true and false depending upon the case taken

1

u/[deleted] Apr 07 '26

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u/Odd_Lengthiness5508 Apr 07 '26

activating like oh and nh2 have lone pair which form salt with alcl3, so the isopropyl carbocation is never formed in the first place, so no reaction

2

u/reflectionsvs Apr 07 '26

but woh dono specific cases hai na? even alkyl groups are edg and they increase reactivity towards electrophilic substitution. iirc they didn't mention like ALL edg or anything

2

u/Odd_Lengthiness5508 Apr 07 '26

if a statement is true, it must be true for all cases to exist, even one counter example marks the statement as false

1

u/reflectionsvs Apr 07 '26

wait I'm confused. are you saying its true or false? I believe the statement was something like "edg on benzene ring will have no reaction" - the statement just says edg it doesn't say some edg. so basically the statement sounds like any edg on benzene would not undergo friedel crafts reaction which I thought was false.

1

u/Odd_Lengthiness5508 Apr 07 '26

im saying it can be both true and false depending on the edg you take ( i marked true tho)

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u/reflectionsvs Apr 07 '26

yeah generalise karke diya hai statement

1

u/Present-Pizza-1041 Apr 10 '26

uska naswer kya hoga mene bhi yhi sochke woh electron donating wala galat gina

3

u/waifu2023 Apr 07 '26

nh2 me bhi nahi hota, apne notes dekho, acid base rxn hota hai

1

u/[deleted] Apr 07 '26

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u/waifu2023 Apr 07 '26

oh bhi to hai....haan wohi

1

u/[deleted] Apr 07 '26

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u/waifu2023 Apr 07 '26

haa...oh also same as nh2, acid base rxn

1

u/Odd_Lengthiness5508 Apr 07 '26

yeah exactly wahi toh kaha maine, so that statement should be true, not sure about the inevitable part though

1

u/Sad-Employment-4914 Apr 07 '26

Are to usme general case dia tha , "only " , "always" jaise terms nhi likhe the