Chemistry: Post your doubts here!

[A star]

Reaction of (-CN) group wid dil H2SO4.....?name of tge reaction nd productx..

 

[iKhaled]

Reaction of (-CN) group wid dil H2SO4.....?name of tge reaction nd productx..

the reaction is called hydrolysis of nitriles (this is in acidic conditions)

product: carboxylic acid and ammonium salt of sulphate

 

[A star]

Q) in a reaction if we use HCN or KCN does it matter?

 

[iKhaled]

Q) in a reaction if we use HCN or KCN does it matter?

i think it mattters with the conditions only..but you will have the same product. i also think its faster with KCN than with HCN

 

[syed1995]

Q) in a reaction if we use HCN or KCN does it matter?

I think it won't matter. But HCN is what we should use as the reagent .. with some KCN in the start to start the reaction.. KCN acts as a catalyst cuz at the end we get the KCN back..

 

[A star]

so if i write HCN in reagents KCN must be mentioned?

 

[syed1995]

so if i write HCN in reagents KCN must be mentioned?

Aye. Or else the reaction would be really slow.. At least that's what my teacher told me.

 

[A star]

Aye. Or else the reaction would be really slow.. At least that's what my teacher told me.

ok

 

[megamind]

CH3CH2COCl + H2NCH2CH2CH3 = CH3CH2CONHCH2CH2CH3 + HCL , why is the reaction mechanism nucleophilic substitution in this case. Please explain

iwant to know that too,some thing connected to my question

 

[abruzzi]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s03_qp_2.pdf
Please explain qn no. 1 d, looks so damn easy but I just can't think of what to do

 

[megamind]

is Diazotization neucleopilic substitution?

any one smart enouh to anwser that!

 

[A star]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s11_ms_23.pdf check ans 3b the graph drawn is wrong isnt it. we have to draw sodium above phosphorus and sulfer?

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s03_qp_2.pdf
Please explain qn no. 1 d, looks so damn easy but I just can't think of what to do

well hees is what to do you can see the graph judge what point is the graph showing peak with Cl35 and cl37 we can see that Cl35 is around 32 and Cl37 around 11 so we can use the formulae ( (32\43 *35) + (11/43 *37) )/100 = 35.475 which is 35.5

 

[megamind]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s03_qp_2.pdf
Please explain qn no. 1 d, looks so damn easy but I just can't think of what to do

relative height of 37Cl to 35Cl is 3:1 or 75% and 25%
so RAM=((75x37)+(25x35))/100=35.5

once again dont thank me just get some one to anwser my question on diazotisation please

 

[megamind]

well hees is what to do you can see the graph judge what point is the graph showing peak with Cl35 and cl37 we can see that Cl35 is around 32 and Cl37 around 11 so we can use the formulae ( (32\43 *35) + (11/43 *37) )/100 = 35.475 which is 35.5

one step ahead yo

 

[salvatore]

CH3CH2COCl + H2NCH2CH2CH3 = CH3CH2CONHCH2CH2CH3 + HCL , why is the reaction mechanism nucleophilic substitution in this case. Please explain

iwant to know that too,some thing connected to my question

A nucleophilic substitution reaction is when a nucleophile replaces the leaving group.. right?
In this case, the leaving group is the halogen, Cl, and it is replaced by Nitrogen (And the rest of the compound). Nitrogen is a nucleophile because it consists of a lone pair of electrons. Hence, nucleophilic substitution reaction!

 

[megamind]

A nucleophilic substitution reaction is when a nucleophile replaces the leaving group.. right?
In this case, the leaving group is the halogen, Cl, and it is replaced by Nitrogen (And the rest of the compound). Nitrogen is a nucleophile because it consists of a lone pair of electrons. Hence, nucleophilic substitution reaction!

thanks
but can you tall me if diazotisation is nucleophilic substitution

 

[unseen95]

A nucleophilic substitution reaction is when a nucleophile replaces the leaving group.. right?
In this case, the leaving group is the halogen, Cl, and it is replaced by Nitrogen (And the rest of the compound). Nitrogen is a nucleophile because it consists of a lone pair of electrons. Hence, nucleophilic substitution reaction!

thanks bro

 

[unseen95]

please help me with 6(e) and (f) with displayed formula so that i can understand the product. Link to the question paper is http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_y07_sp_4.pdf

 

[abruzzi]

well hees is what to do you can see the graph judge what point is the graph showing peak with Cl35 and cl37 we can see that Cl35 is around 32 and Cl37 around 11 so we can use the formulae ( (32\43 *35) + (11/43 *37) )/100 = 35.475 which is 35.5

relative height of 37Cl to 35Cl is 3:1 or 75% and 25%
so RAM=((75x37)+(25x35))/100=35.5

once again dont thank me just get some one to anwser my question on diazotisation please

Thank you for your help.. could you please explain what the marking scheme has done?
megamind I've no idea about this but I'll do my best to find you an answer