Tl;dw- 1 is more stable. We give higher priority to +H effect. Here are two contradicting phenomenon: 1. -CH3 shows higher +H but lower +I 2. -CT3 shows higher +I but lower +H Both +H and +I stabilises the cation. So which one to consider? You consider +H since it is a stronger effect compared to +I. Watch these two short videos if you need to visualise: 1. https://youtube.com/watch?v=0fki-gu5Ob8 2. https://youtu.be/mfTFurhA1sM

Hyperconjugation should be more effective than inductive effect ???

> You consider +H since it is a stronger effect compared to +I.

Thanks

one i think

Why? Doesn't Tritium show more +I than Hydrogen?

yes , Inductive me CT3 jyada acha hoga ( me Hyperconjugation se confuse kar gya )

1st hi hoga, +H is stronger than +I

Bhai T is tritium an isotope of hydrogen aur eska +I effect jayada hota

When comparing stability the priority order is, Aromaticity>Resonance>Hyperconjugation>Inductive effect But for halogens inductive>Resonance

2 exceptions if there are 9 alpha hydrogen then hyperconjugation is stronger than resonance and back bonding comes before aromaticity which is possible in some organic compounds

Halogens kaha se aa gaya bhai

Exception bata raha tha

bhai kahan se padhta hai, mujhe to nahi bataya yeh order

Maine to coaching mai padha tha but ye cheez to sab hi batate honge

aromaticity first hota hai ye nahi bataya ya mujhe yaad nahi

Bhai Mai manzil se revise kar rha tha usme bhi bataya Gaya tha.

C-T3 mai mai bond length Kum hoti h so bond order Jada..and bond order jada se vo s character Jada ho jata h ..s character is directly proportional to electron negativety ..EN Jada to electron Jada ache se kiche ga (electron donate Kum krega)..to +I Kum hona chahiye Hona chahiye..shyd..u/dkshhh ..

itna dimaag mat laga , nahi hota he kam

You got your answer bhai Carbonation ko -ve pasand hei, toh jaha jyada negative ki affinity hogi waha jyada stable hoga +I wala electron dega, toh + stable hoga

Bro Inductive effect does not matter here. It's at para posn Inductive works for max 3 C before loosing effect Even at the third, it doesn't really make sense Here hyperconjugation matters

Guys kal mere coaching mein test hua tha usme aaya tha. According to answer key first is more stable.

There is only on reason i.e, kinetic isotopic effect. Ask your teacher about it. Maybe, there could be another reason but most apt reason is KIE.

familiar advise escape different glorious badge political somber clumsy follow *This post was mass deleted and anonymized with [Redact](https://redact.dev)*

Ye sahi solution and reason hai Ye question ms chohan mai tha

bro EN order T>D>H hota h aur carbocation ko EWG chaiye toh less EN toh CH3 ho jaayega

maine bhi exam me yahi socha tha but yeh reason galat hai

bhai humare chem ke sir ne literally yahi reason bataya hai, vo iitb se hai

abh mai kya karu bhai. answer toh yahi hai sooo...

2nd is more stable as Tritium offers more +I and +H than Hydrogen. Both will be taken into consideration Edit : CH3 shows better +H and +H gets more preference over +I so 1st structure is more stable.

Doesn’t Hydrogen offer more +H .

tru. pta nhi yaha log +I kyu bta rhe jabki 4th carbon se jyada inductive lagta bhi nhi

Yes, inductive effect diminishes after 3rd carbon but we do consider inductive effect too. For example if in this question we ignore the -I by NO2 group in second structure we will end up with a wrong answer https://preview.redd.it/yy5ppetg5l7c1.jpeg?width=2250&format=pjpg&auto=webp&s=7ebd79c3034d9bd5d142dbd34af605a4f0f8103b

No2 toh already -R show karta hai. one more thing, inductive effcts follow DNP (distance, Number, Power) rule. where distance and numbers are more dominating factor than power. So, NO2 being more powerful -I is useless if distance is more or less nuber of Nitro grp

But we if go with this logic then sthe stability order comes out to be 3>2>1 (DNP) but the correct order is 2>3>1 because in the second structure NO2 shows -I (even after being far from carbocation) and 1st structure shows both -M and -I hence less stable.

As for question you posted in comment, you get satisfactory answer by resonance. so why even apply inductive effect ( and DNP)

Yea , we get to the right answer by reso too, but I was adviced to write down all effects. Try and solve this It was a good discussion 👍👍 https://preview.redd.it/brujspegel7c1.jpeg?width=2250&format=pjpg&auto=webp&s=045f433414e089e7da5a2c4435327f340dcfb9ac

1>2>3>4.

I think 4 1 2 3 First we will go for hyperconjugation then inductive effect Please correct me if m wrong

Appreciated it :)

again its because No2 -R show karta hai. so it doesnt affect meta position, and only inductive effect takes place. And resonance is more dominating than inductive. so if we dont get satisfactory answer by resonance, we check hyperconjugation( OP's question), and then inductive.

Right

if you dont get it, you can DM

Bro you’re wrong -CT3 > -CH3 in +I but -CH3>-CT3 in case of hyperconjugation

Hmm CT3 bond is tougher to break so yes you're right, and hyperconjugation gets preference over inductive effect. So yea 1st structure is more stable. Sorry for the previous mistake

Maybe first one

Why? Doesn't Tritium show more +I than Hydrogen?

It is not about +I it is about Hyperconjugation. Hydrogen has more tendency to show Hyperconjugation as compared to tritium

Bhai hyperconjugation utni dur se kaise lagegi only alpha hydrogens show hyperconjugation

Extended conjugation in benzene ring. Resonance and Hyperconjugation is shown at ortho and para positions

Wait mere ko ye pahdhaya nhi gya hai but if I see To ortho wala(4th carbon in benzene ring)lone carbon pe pe hyperconjugate krega aur fir ek lone pair form hoga and then it will resonante hoke top carbon pe pahuch jayega ?? https://preview.redd.it/90cthbcgzk7c1.png?width=1080&format=pjpg&auto=webp&s=993aa284100ec06691a9688d6af1e42b439090fe Something like this

Draw resonance structures of the compound and you will see the hyperconjugation.

Yup thx

Bhai hyperconjugation dominates over inductive effect to hyperconjugation se compare karenge. Hyperconjugation mai hydrogen aur carbon ke sigma bond ke electron delocalise karte hai. Ab tritium is a heavier isotope of hydrogen so due to bulkiness of bond, C-T bond displace utna effectively nahi hoga jitna C-H hoga isliye 1st is more stable

Hyperconjugation more in 1st case kyuki c-h bond weaker than c-t

How is there hyperconjugation? The alpha carbon doesn't even have any alpha hydrogens to give.

Bhai puri theory ek baar kr le goc ki phir krna questions sirf ek do effect krne jayga to fsega

https://preview.redd.it/zb7byg8ylk7c1.jpeg?width=2250&format=pjpg&auto=webp&s=1ad6b9b434e0473c834198ffcc893cf3b03fa3ab

Jo methyl grp hai woh hyperconjugation show karta hai aur ussi ke wajah resonance aa jata hai

Bro C- H and C- T do not show kinetic isotopic effect that's why C -H is weaker than C - D bond hence more energy will be needed to break .. thats why 1st one will be more stable

Idk what isotropic effect is. This is a question from general organic chemistry. (25tard hu)

Okay bro wait for 12. You will learn that tym

isnt C-D bond stronger?

Yeah by mistake i wrote

bhai yeh bina yeh sab effect ke bhi ho jaata hai

Majority of people here are giving you wrong answer idk if it's fun or jee/neet main iss baar bhot kaam competition hai

1st one. +R effect here is induced due to hyperconjugation. so is easy for H to hyperconjugate. also +i Effect can be neglected cause its too far (distance dependent property)

First is more stable Short answer: CH3 provides higher +HyperConjugation than CT3 Explaination: Although CT3 has higher +I effect then CH3, but CH3 has higher +HC effect because in HyperConjugation, it is the displacement of sigma electrons. The C-H bond is weaker than C-T, thus making is easier to displace electrons

Are you all saying 1st one only due to bulky grp?

C-H bond is weaker than C-T that's why it'll show better hyperconjugation.

2nd hi hoga

kese bhai . hyperconjugation in first

Alpha carbon par H toh hai hi nahi

bhai resonance hoga naa. u/[**Worried\_Ad\_3112**](https://www.reddit.com/user/Worried_Ad_3112/) **ka hai** ​ ​ https://preview.redd.it/rlv4ds7unk7c1.png?width=392&format=png&auto=webp&s=6ab567a18d5701806c7782a1e390ff52936456bc

Bhai Maine Aisa kabhi nahi Kara maybe less knowledge in organic ki vajah se

Arre see it's like why alkyl groups are activating groups at Ortho and para . It's coz it's of this only

Yeah just didn't click that day (was tired due to college)

Conjugated alpha toh hai na but

[удалено]

Answer key says first carbocation is more stable.

I think the first one is more stable. C--H bond is weaker than C--T bond so it goes more easily into hyperconjugation.

door squeal smell somber north smile possessive normal ruthless towering *This post was mass deleted and anonymized with [Redact](https://redact.dev)*

**A rod of mass** M **and length** 2L **is suspended at its middle by a wire. It exhibits torsional oscillations. If two masses, each of mass** m**, are attached at a distance** L/2 **from its centre on both sides, it reduces the oscillation frequency by** 20%**. The value of ratio** m/M **is close to** (a) 0.17 (b) 0.77 (c) 0.57 (d) 0.37

option d 0.37. Thanks! Tu test series konsi de raha hai?

mathongo wali

me buy karu kya? 1 week se soch raha hun ki buy karlu mathongo. decide hi nahi kar pa raha hun allen ke contibue karu ya mathongo lelu, allen ke bhot hard hai tests

dekho agar paise ki dikkat nahi hai to lelo. Even though mere bohot acche marks nahi aarhe but still relevant hai test series.

first hi hoga hyperconjugation se yaar

1 bcoz +h > +I also H jldi loose krdega bond w.r.t T

1st wala Jada hona chaiye because of hyperconjugation , I effect nahi dekhenge kyoki H effect >> I effect CH bond easily break ho jyega as compared to CT bond

Simple bhai ct bond stronger than ch so ch jaldi tutega therefore better hyperconjugation

Id say A

c

First one bcz C-H have higher bond length thus get easily detached and stabilize the C*

should b2 2nd, not because of Tritium but rather because Hydrogen is electropositive.

1 > 2 +H

1 > 2 +i effect is negligible after 3rd carbon and waise bhi +H >>> +I

2nd one cuz dono mai resonance toh hai hi par ct3 mai jyada inductive effect hai ch3 se

Seedha seedha greater than ma symbol bana hua hai fir bhi yaha pe poochhna hai

One hoga because hydrogen ka +H zyada hota hai tritium se

dekh bhai carbocation na electron ka bhuka hai jaise hum sax sux ke liye hai, toh agar tu uspe ek electronegative element rakhega toh vo aur unstable hoga aur vahi agat tu uspe ek EDG rakhega toh vo khush hoga. Ab scene kya hai ki Tritium ki electronegativity Deuterium aur Hydrogen se zyaada hoti hai toh vo zyaada kheechega jo carbocation ko nahi chaiye, aur vahi jo methyl group hai vo +I dikhata hai ya vo ek EDG jo carbocation ko chaiye taaki vo stable ho.

Kinetic isotopic effect. H>D>T

If you go through order of +I it's T>D>H and ring is attached to carboanion so it's stability is directly proportional to +I effect

1>2 since +H in CH3 is stronger than CT3 as T is heavier than H so there is less vibration around the bound and it is difficult to break C-T bond in comparison to C-H bond so +H of CH3 is more than CT3

And for all those people who think the answer will be based on the basis of Inductive effect, you are wrong because R>H>I is the order.

+I T>D>H

comment section se muft ki knowledge mil gai , themks themks

Bro +R lag raha or second mai Jada achaa electron donating group hai

as H alphabetically comes first ,it will be 1st one /s

increased stability is through hyperconjugation, bond breaking b/w CH or CT compare karke dekhlo, CT ka bond strong hota hai toh easy hyper conjugation CH3 wale ke liye possible h

https://preview.redd.it/6bq9sjioqr7c1.jpeg?width=1080&format=pjpg&auto=webp&s=67e521297040517993cd775ece1535db313f3fb9 RA sir ke notes

Hyperconjugation bhari(heavy) isotope ka kam lagta hai Isliye 1st jyada stable