Chemistry: Post your doubts here!

[zem]

Anyone??

 

[Snowysangel]

Need help! View attachment 45096

Is it D?

 

[zem]

Is it D?

No Its C!

 

[Snowysangel]

Anyone?? View attachment 45097

Is it A?

 

[zem]

Is it A?

No B

 

[Snowysangel]

No Its C!

Oh it's cause they're in a 2:1 ratio. If one mole if sulfite loses 2 moles of electrons than 2 moles of the metal will gain two moles of electrons, meaning one mole if the metal will gain just one mole of electrons

 

[ZaqZainab]

Anyone?? View attachment 45097

it is clearly an alcohol and a tertiary one as it is mentioned DOES NOT
Try making a tertiary alcohol WITH chiral center
so the center carbon can not be bonded to 2 CH3
the central carbon is bonded to OH,CH3,CH2CH3 and CH2CH2CH3

 

[kingo44]

Na will react with both Na and COOH okay so
when it reacts with 1 OH it will give charge of -1 and then another OH it will become -2 and then with COOH it will be -3 as the question says
and NaOH will only react with COOH
so it will give -1 with one COOH thats it
but for A there are 3 OH groups and 1 COOH

ok but 2 na in naoh reacts with cooh in other questionj

 

[zem]

it is clearly an alcohol and a tertiary one as it is mentioned DOES NOT
Try making a tertiary alcohol WITH chiral center
so the center carbon can not be bonded to 2 CH3
the central carbon is bonded to OH,CH3,CH2CH3 and CH2CH2CH3

Oh i see thankyou

 

[Snowysangel]

No B

C makes the most sense though. Because it can't be oxidized by kmno4 it has to be a tertiary alcohol with 3 different carbon groups attached to the central carbon

 

[zem]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w09_qp_11.pdf questions 21 27 and 40

 

[Snowysangel]

it is clearly an alcohol and a tertiary one as it is mentioned DOES NOT
Try making a tertiary alcohol WITH chiral center
so the center carbon can not be bonded to 2 CH3
the central carbon is bonded to OH,CH3,CH2CH3 and CH2CH2CH3

But that makes a total of 7 carbons

 

[ashcull14]

t

is it C? 940+2(-110)= +720

hnks

 

[unique111]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s13_qp_13.pdf
Q.28 C
Q.29 D
Q.30 C

 

[Snowysangel]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s13_qp_12.pdf 25 D

Could someone explain this?

Please help!!!!
View attachment 45092[|quote]
Is it C?

 

[ZaqZainab]

But that makes a total of 7 carbons

isnt it he answer

 

[ZaqZainab]

C makes the most sense though. Because it can't be oxidized by kmno4 it has to be a tertiary alcohol with 3 different carbon groups attached to the central carbon

can you tell me the paper
cause i did a paper with the exact question some days back and the answer was 7

 

[ZaqZainab]

ok but 2 na in naoh reacts with cooh in other questionj

What?

 

[unique111]

Could someone explain this?

With conc. H2SO4, dehydration will occur. The OH of alcohol plus a H from neighbouring C is lost forming a double bond. Hope the picture helps.

 

[chishtyguy]

+1 to this.
anyone, help plz.
why not B?

U mean david Acaster. Roger Norris, Lawrie Ryan BOOK ?? Orange cover??!
I revise it,i am still scoring from 25 - 29
Thnx man
Inshallah i will

Yes that's the one, if that is your score then inshaAllah u will Obtain an A..