JEE Chemistry Club

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Gaurang Tandon

00:54

Q: n-factor of FeO in the reaction of ferric oxide with vanadium (II) oxide

In the following reaction, what is the n-factor of $\ce{FeO}$? $$\ce{2VO + 3Fe_2O_3 -> 6FeO + V_2O_5}$$ I believe it should be 1, according to the standard "change in oxidation number" formula, but the answer is given as $\frac{3}{2}$. Which one is correct and why?

redox

@Abcd @AvnishKabaj @IceInkberry @Jasmine I am getting n-factor = 1 in this question...Is anyone else getting 3/2?

Oh hi @K.Chopra, didn't realize I posted the same question you did :P

5 hours later…

Avnish Kabaj

05:52

@GaurangTandon I got 1 too

Alphanerd

did anyone of you clear jee adv ?

2 hours later…

starunique2016

07:57

that cinversion

see

drastic oxidation of salicylic acid

then sort of a skeleton we get

then we just have to convert one side to alkene

by protecting on carbonyl group

got it only last day.:d

2 hours later…

Anonymous

10:30

@GaurangTandon I am getting $3/2$

Anonymous

n factor in oxidation/reduction of same compound is $\dfrac {a×b}{c}$

Anonymous

Where $a$= Change in oxidation number $b$= Initial number of moles of the compound and $c$= Final number of moles of the compound (Had to write in A B C form due to mathjax)

Anonymous

Here, it will be $\dfrac {(12-9)×3}{6}$

Gaurang Tandon

10:49

interesting

@IceInkberry How did you get a= Change in oxidation number

initial oxidation number is 3, final is 2

so the diff should be 1

Anonymous

Sorry T_T

Anonymous

This is so embarrassing that I do mistakes every single time

Anonymous

No, I am wrong

Anonymous

Totally wrong

Anonymous

Sorry

Anonymous

10:59

So, I get $1/2$

Anonymous

11:17

@GaurangTandon Umm, wait, n-factor is change in oxidation number per mole of substance. So, I am right?

Gaurang Tandon

11:37

so where'd you get the 12 and 9 from, I still don't understand :/

4 hours later…

Avnish Kabaj

15:24

Turns out our chem syllabus was going slow because our sir taught us a lot of reactions beforehand from cooh and nh2

We finished ald&ket & cooh

Today

And amines by Saturday

Maths toh Integration will be left before the phase tes

Physics sir says he'll finish magnitism in 4 classes

I doubt that tho

Anonymous

16:00

@GaurangTandon Okay, I am probably really wrong. I am not commenting on this question, I take my words back. I don't like this chapter ._.

Anonymous

@AvnishKabaj Like while teaching something comes up and while discussing some questions something comes up and he teaches that?

Jasmine

@AvnishKabaj were you taught sets and relations

Anonymous

If that is the case, our teacher is the same lol. We are way too back, I hope our class gears up.

Jasmine

Our teacher took 3 class and indefinite integration gone

I dont know why so much in speed

Anonymous

Is that there in your phase test?

Jasmine

16:08

@IceInkberry can you tell me how fo you decide position of attacking

I always attack at wrong place

I really dont get sometimes why negative charge attac each other

Anonymous

@Jasmine Attack where, whenever someone says attack I remember chess but I know you mean organic chemistry. Do you? If yes, I am not the right person to ask.

Jasmine

@IceInkberry lol its a lolipop question though

Anonymous

Because I haven't even started with real organic chemistry yet.

Anonymous

Dangling with alkyl halides

Jasmine

Whike consider a molecule containing an electrophilic C and H where will attack happen

Some factors in mind- 1. Which is a better elecrophile

Anonymous

16:13

Like if it will abstract H or attack C?

Jasmine

After attack which is a better leaving group

@IceInkberry yeah if you say in a more accurately

And what will form a more stable product

Anonymous

If it is a nuclephile like CN- it will attack the Electrophilic carbon. The property of a base is to abstract acidic hydrogen(If present). So if you have OH- and a Electrophilic carbon as well as acidic hydrogen, the OH- will abstract the Hydrogen whereas CN- will attack the Electrophilic carbon.

Anonymous

I have been taught that in basics.

Anonymous

1) Identify if the attacking thing is base or nucleophile

Anonymous

2) Check if better leaving groups are present

Anonymous

16:17

3) Check the solvent because some groups like OH become better leaving groups in acidic environment

Anonymous

I don't know if that is even relevant to your question

Jasmine

@IceInkberry very much relevent thanks

Avnish Kabaj

@IceInkberry ya

@Jasmine nope

Jasmine

I always wanted to be taught from base

Never never mind

@AvnishKabaj will that come in phase test or only in school exams

Anonymous

@Jasmine By the way, it is in JEE mains syllabus only

Avnish Kabaj

16:21

@Jasmine one or two questions always come from useless chapters like those

Anonymous

Not in JEE advanced

Jasmine

@IceInkberry oh i forgot

@AvnishKabaj biomolecules questions will be there in phase test

Oh too much to do good night

Avnish Kabaj

@Jasmine ya

Jasmine

@AvnishKabaj ok

Abcd

17:23

@Jasmine How are you handling biomolecules' carbohydrate part. Its so irritating.

@AvnishKabaj no he will finish it. Its very short chapter.

Avnish Kabaj

@Abcd o.O

It's the biggest package

Abcd

@AvnishKabaj it has much variety. He will finish his syllabus but you wont get time for practice.

@AvnishKabaj Your centre will set the paper. FIITJEE delhi is the ruler right? Why dont you request them to shift the dates

@AvnishKabaj Everyone is struggling with maths syllabus and physics practice, why doesnt fiitjee delhi understand that

Avnish Kabaj

@Abcd cbt was pre booked

Abcd

@AvnishKabaj what is CBT

Avnish Kabaj

@Abcd that's sad

@Abcd computer based test

Abcd

17:32

@AvnishKabaj :( ....But they do this nonsense every year sir told us.

Last 2-3 years they did this nonsense and then shifted the dates

Avnish Kabaj

¯\_(ツ)_/¯

Only sankalps syllabus is complete

Anonymous

After reading the above messages, I want to wish all FIITJEE students all the best

Abcd

17:55

@AvnishKabaj chemistry.stackexchange.com/a/65202/51553

@AvnishKabaj Read the part "source books"

@AvnishKabaj This is a reply to "Jan diasgrees" comment of yours.

@IceInkberry Thanks a lot :)

Avnish Kabaj

@Abcd don't remember

Abcd

@AvnishKabaj Let me link you to it.

Q: Reaction of tert-butyl bromide with silver nitrite

We know that reaction of $\ce{AgNO2}$ with alkyl halides is SN1 type reaction and follows HSAB principle. So in the reaction of $\ce{(CH3)3C Br}$ we would expect $\ce{AgBr}$ to form and also a carbocation $\ce{(CH3)3C+}$. According to HSAB, since the electrophile is hard, we expect the hard nuc...

organic-chemistry nucleophilic-substitution hsab

Jan disagrees

I’m up to answering this as it is a very interesting phenomenon. I probably won’t be able to until in a few days time. In any case let me drop the hint that any argument involving HSAB is wrong.

— Avnish Kabaj May 12 at 9:13

Avnish Kabaj

18:11

@Abcd meh the dude's written sources and you don't know what's been cited

2 hours later…

Jasmine

19:55

@abcd not yet started bimolecules but it looks it has lots of memorising stuff

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