Chemistry: Post your doubts here!

[Metanoia]

So the other one is oxidised and it becomes redox....so 2 is redox
and so is 1 as you mentioned earlier
the answer is B ( 1 and 2)

Yes , the carbon in methane is oxidised, -4 to -3

 

[My Name]

Yes , the carbon in methane is oxidised, -4 to -3

Okaay
Ty

 

[princess Anu]

if that is the case then carbonyl compounds should also be soluble and so should be any ester! :|

Don't forget that the complete definition also includes a portion where the partially positive H atom is attracted to a lone pair of a neighboring molecule.
The CO2 is responsible for the yellow portion.
http://www.answers.com/Q/Does_carbon_dioxide_form_hydrogen_bonds_with_water

 

[awesomaholic101]

can somebody solve thissView attachment 51422

H2O CO H2 CO2
initial no. of moles: 1 1 0 0
n at equilibrium : 1-x 1-x x x

* x = no. of moles of H2O and CO reacted
* whatever the position of equilibrium, there are 2 moles of gas present.

so, no. of H2 formed = 33.3/100 * 2 = 0.666

n(H2) = n(CO2) = 0.666
n(H2O) = n(CO) = 1 - 0.666 = 0.334

Therefore, Kc = (0.666^2)/(0.334^2)
= 3.97608 = 3.98

is the answer correct?

 

[Metanoia]

if that is the case then carbonyl compounds should also be soluble and so should be any ester! :|

Not really, remember that organic molecules also have a hydrophobic segment. Recall why alcohols become less soluble as the chain increases. H bonding needs to be significant enough to allow a molecule to dissolve in water, it doesn't mean that a substance will definitely dissolve just because it has H bonding,

 

[princess Anu]

yes. I didn't get why u multiplied the moles of H2 by 2?

H2O CO H2 CO2
initial no. of moles: 1 1 0 0
n at equilibrium : 1-x 1-x x x

* x = no. of moles of H2O and CO reacted
* whatever the position of equilibrium, there are 2 moles of gas present.

so, no. of H2 formed = 33.3/100 * 2 = 0.666

n(H2) = n(CO2) = 0.666
n(H2O) = n(CO) = 1 - 0.666 = 0.334

Therefore, Kc = (0.666^2)/(0.334^2)
= 3.97608 = 3.98

is the answer correct?

 

[The Chill Master]

Well it seems, someoene already answered...
The Chill Master : you gotta check my reasoning..bcos in question 8 i think the functional group is Ketone and Aldehyde and not alcohol..Bcos according to my understanding if its alcohol the valency of carbon is not filled...draw the displayed formula and see if i make sense

http://postimg.org/image/8jdjxeqi1/

but an aldehydes means carbon aTom attached directly to functional group and and an h .Though I am not sure

 

[The Chill Master]

I know it HAS to be Aldehyde the answer for that is A!
17 is A Bravo THNX

for question 25 1 AND 3 is not an option remember?

If the answer is A then it can be Ketone and alcohol because Alcohol will react with alcohol and not with ketone.

 

[My Name]

but an aldehydes means carbon aTom attached directly to functional group and and an h .Though I am not sure

yes ...ALDEHYDE

 

[My Name]

Thank you XPC-ians
All help is highly appreciated.

 

[ashcull14]

What is the number of isomers of C2H2Cl2 including cis-trans isomers?
A= 2 B= 3 C =4 D= 5 how is the answer B can anyone draw the structures and explain? PLZ?

 

[ashcull14]

how is the answer B?

 

[The Chill Master]

Well it seems, someoene already answered...
The Chill Master : you gotta check my reasoning..bcos in question 8 i think the functional group is Ketone and Aldehyde and not alcohol..Bcos according to my understanding if its alcohol the valency of carbon is not filled...draw the displayed formula and see if i make sense

http://postimg.org/image/8jdjxeqi1/

How did you got 17?
Explanation please

 

[The Chill Master]

yes ...ALDEHYDE

Yeah and in that qstn this grp isn't present.

 

[The Chill Master]

What is the number of isomers of C2H2Cl2 including cis-trans isomers?
A= 2 B= 3 C =4 D= 5 how is the answer B can anyone draw the structures and explain? PLZ?

There you go the 3 types of isomers that can be formed

 

[The Chill Master]

how is the answer B?

Because B is an aldehyde
A is an Alkene i think
C & D are ketones

 

[ashcull14]

There you go the 3 types of isomers that can be formed
View attachment 51434 View attachment 51435 View attachment 51436

oh thnks

 

[Metanoia]

Thank you XPC-ians
All help is highly appreciated.

 

[The Chill Master]

Thank you XPC-ians
All help is highly appreciated.

 

[princess Anu]

how does Nitrogen have only 1 lone pair? :/