Chemistry Paper 2

[Silent Hunter]

what about the question 1?which required to write a liquid from the period 3?

i did phosphorus donno its correct or not

 

[Pals_1010]

this one is wrong....it had only two carboxlic groups.

Oh I know.... I have drawn the molecule twice. One is the cis- isomer and the other one the trans-isomer

 

[Pals_1010]

i did phosphorus donno its correct or not

I wrote Silicon. I thought of tetrachlorides which are liquids

 

[Assad Ali]

Oh I know.... I have drawn the molecule twice. One is the cis- isomer and the other one the trans-isomer

oh good thn...i pray that threshhold drops to sustainable marks.

 

[Assad Ali]

i

i did phosphorus donno its correct or not

i also wrote the same.Altough many says silicon is the right option.

 

[aaditya menon]

Do both the -COOH groups get converted to ester? Or just one of them?

 

[Silent Hunter]

well chemistry endorsed book says phosphorus as liquid.......... the latest edition book..... so just remembered this thing and quickly wrote phosphorus down without giving a second thought......... i hope its correct

 

[Silent Hunter]

Do both the -COOH groups get converted to ester? Or just one of them?

Talking abut wich question bro?

 

[aaditya menon]

Talking abut wich question bro?

The organic question, maleic acid and alcohol esterificaction?

 

[Silent Hunter]

the one which had many boxes and u had to fill em ?

 

[Silent Hunter]

i dont remember exactly...i think it was both ov em cuz where ever there will be -OH it will react will all of the -COOH groups

 

[aaditya menon]

Ahan, Im darn confused about that. What I drew was one -COOH group to ester group and the other remains.
This is what wiki says

" It hydrolyzes, producing maleic acid, cis-HOOC–CH=CH–COOH. With alcohols, the half-ester is generated, e.g., cis-HOOC–CH=CH–COOCH3."

^BIG RELIEF ! By it, they mean maleic anhydride which on hydrolysis produces the acid.

 

[rehan751]

I don't know why I drew the displayed formula instead of skeletal for cis-trans isomerism. How many marks was that part?

 

[Gémeaux]

well chemistry endorsed book says phosphorus as liquid.......... the latest edition book..... so just remembered this thing and quickly wrote phosphorus down without giving a second thought......... i hope its correct

Si an P both have chlorides that are volatile liquids, so both answers should be correct.

 

[Silent Hunter]

yep.....i think the same

 

[vishal]

35 in P12, 53 in P22 and 16 in P33.........Will these marks in chemistry fetch me an A in AS?

 

[mujtabashahnawaz]

i did phosphorus donno its correct or not

Phosphorus and Silicon both are correct. I did Phosphorus

 

[Ash1994]

Ohhh... for temperature and catalyst I didn't use that, but for pressure I used it BUT I wrote 2 answers for that, so I guess they will give me marks for that,
And btw, that emperical formula that we had to finddd...... what was that? I got C10H13O11

Hey I got C10H13O11 too!
It was hard finding the integral number right? then everything came out right on multiplication with 10?

 

[Ash1994]

guys if we have wrong answer for empirical formula
how many marks will we get for working?

Yeah you get 1 mark i saw in marks schemes you get it for the part where you work out the moles for each element provided they are right duhh!

 

[Ash1994]

No it was as, Ar is inert because it has a complete octet of electrons/ stable electronic configuration.

I wrote that too!