Chemistry: Post your doubts here!

[Musab100]

product b and e

 

[1357911]

Correct, Both of them.

 

[Musab100]

Correct, Both of them.

why its not matching with mark scheme

 

[Musab100]

Correct, Both of them.

https://www.xtremepapers.com/community/attachments/imag0759-jpg.32625/
and this one ???

 

[1357911]

product b and e

Product E is wrong.

 

[Musab100]

y

Product E is wrong.

product E or part e ???

 

[1357911]

y
product E or part e ???

Sorry. Product B

 

[Musab100]

how it is wrong u said its correct

 

[1357911]

how it is wrong u said its correct

That was for optical isomerism plus the cis trans isomerism.

 

[Musab100]

That was for optical isomerism plus the cis trans isomerism.

are both optical and cis trans isomers wrong u said optical is right

 

[salvatore]

Could someone please help me with the following question?
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s10_qp_42.pdf
qn no. 1 (iv)

I do not understand how the mechanism is drawn in the marking scheme. In addition, I also don't get why the examiners report has stated that this is an SN2 mechanism. I'll appreciate if someone could help me solve this.

Thanks

I'm re-posting this.. anyone??

 

[danyaljamil]

I'm re-posting this.. anyone??

this is a primary halogenoalkane which always have a SN2 mechanism while undergoing reaction as for the drawing its pretty clear lone pairs shown on the nuclophile attacking the carbon with partial positive and negative on cl the intermediate shown with 5 gropus attached and then cl bond breaking and use curly arrows to show the bonds breaking!

 

[Musab100]

are both optical and cis trans isomers wrong u said optical is right

cis trans

 

[Musab100]

are both optical and cis trans isomers wrong u said optical is right

cis trans

 

[Musab100]

cis trans

isomers

 

[snowbrood]

isomers

when is cis trans isomerism not possible i thought C=CR2 but the examiners says if r=h then it is possible am i right

 

[kalpaveen]

can sum1 plzzz give me a link for a set of gud section B short notes :/

 

[a.abid]

Hey guys, I always have problems in calculating the enthalpy change of reaction, combustion and formation ... I mean I mix up... I don't get which value to subtract and which to add... is there any easy way to learn it? I read the book and its quite confusing like for formation we have to consider the elemnts and the products. .. plz help me if u have any easier method of learning this. .

 

[a.abid]

Hey guys, I always have problems in calculating the enthalpy change of reaction, combustion and formation ... I mean I mix up... I don't get which value to subtract and which to add... is there any easy way to learn it? I read the book and its quite confusing like for formation we have to consider the elemnts and the products. .. plz help me if u have any easier method of learning this. .

 

[Afza Munir]

Hey guys, I always have problems in calculating the enthalpy change of reaction, combustion and formation ... I mean I mix up... I don't get which value to subtract and which to add... is there any easy way to learn it? I read the book and its quite confusing like for formation we have to consider the elemnts and the products. .. plz help me if u have any easier method of learning this. .

hey me to have problem in the same thin its so confusin well I N33D URGENT HELP HERE!!!!!!
how to calculate the enthalpy change of reaction for the following
equation: 2NaHCO3 -----> Na2CO3 + CO2 + H2O
a) delta standard enthalpy change of formation [NaHCO3] = -950.8 KJ/mol
b) " " " " " " " " [Na2CO3] = -1130.7 KJ/mol
c) " " " " " " [CO2] = -393.5 KJ/mol
d) " " " " " " [H2O] = -285.8 KJ/mol

how to do it need complete explanation hope any 1 of ya can help me.........