Chemistry: Post your doubts here!

[ahmed abdulla]

From the question's equation itself.

Replace R` with H.. since it's a Aldehyde.

R can be any alkyl group (CH3,C2H5)

So only possible answers are C and D.. as they are the only ones which contain the bonds Which I have shown in the above pic.

But D will be a product from a ketone as there are 2 R groups, 1 OH and 1 COO- Group attached to it! while we need only 1 R group for a aldehyde.. so answer is C.

still confused between C & D

 

[ahmed abdulla]

(CH3)2CO + H2NNHC6H3(NO2)2 → (CH3)2C=NNHC6H3(NO2)2 + H2O
what is this rn ...? ...? it says that it require room temp among some list given ..
. but y not this >CH3CH2OH + KBr ¨ CH3CH2Br + KOH

 

[tanixx]

32 Which of the following solids contain more than one type of chemical bond?
1 brass (an alloy of copper and zinc)
2 graphite
3 ice
how is the ans 2 and 3 only?

 

[strangerss]

hey everyone alsallum alaykom , can any one please explain the answer in question 3 OCT/NOV 2005?P1

 

[ahmed abdulla]

Which pair of reagents will take part in a redox reaction?
A CH3CH2OH + concentrated H2SO4
B CH3CHO + Tollens’ reagent
C CH3CO2C2H5 + dilute H2SO4
D CH3COCH3 + Fehling’s solution

 

[strangerss]

Which pair of reagents will take part in a redox reaction?
A CH3CH2OH + concentrated H2SO4
B CH3CHO + Tollens’ reagent
C CH3CO2C2H5 + dilute H2SO4
D CH3COCH3 + Fehling’s solution

I think the answer is B , am I right?

 

[ahmed abdulla]

I think the answer is B , am I right?

but y

 

[Aymen Ezazi]

32 Which of the following solids contain more than one type of chemical bond?
1 brass (an alloy of copper and zinc)
2 graphite
3 ice
how is the ans 2 and 3 only?

because brass is a mixture of two metals so will have only metallic bonding between them, whereas graphite has covalent and van der waals forces between its atoms , and ice has covalent and hydrogen bonding..

 

[Aymen Ezazi]

hey everyone alsallum alaykom , can any one please explain the answer in question 3 OCT/NOV 2005?P1

can u plz attach the link with it

 

[Aymen Ezazi]

hey everyone alsallum alaykom , can any one please explain the answer in question 3 OCT/NOV 2005?P1

and Walaikum as salam..

 

[haha101]

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s07_qp_1.pdf

Q no 9 10 12 13 14 16 18 20 22 26 34 37 39 n 40 pleasee

 

[A star]

32 Which of the following solids contain more than one type of chemical bond?
1 brass (an alloy of copper and zinc)
2 graphite
3 ice
how is the ans 2 and 3 only?

brass (metalic bonding)
graphite(covalent,vandervaals)
ice(covalent,hydrogen bonding)
hope it clears it

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s07_qp_1.pdf

Q no 9 10 12 13 14 16 18 20 22 26 34 37 39 n 40 pleasee

i think i answered ur queries

 

[Seewhysee]

Which compounds may result from mixing ethane and chlorine in the presence of sunlight?
1 CH3CH2Cl
2 CH3CH2CH2CH3
3 CH3CHClCHClCH3
Can someone explain this to me?

 

[A star]

Which compounds may result from mixing ethane and chlorine in the presence of sunlight?
1 CH3CH2Cl
2 CH3CH2CH2CH3
3 CH3CHClCHClCH3
Can someone explain this to me?

u serious bro :/
1 cause rest hve more then two Cs

 

[Seewhysee]

E

u serious bro :/
1 cause rest hve more then two Cs

Very serious because the answer is ALL of them...

 

[A star]

E
Very serious because the answer is ALL of them...

tell me the year or send the link

 

[Seewhysee]

tell me the year or send the link

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w04_qp_1.pdf its question 37

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w04_qp_1.pdf its question 37

yeah yeah yeah i get it
1 u know is right
2) when two ethane radicals combine
3) when combination of ethane radical is chlorinated

 

[Seewhysee]

yeah yeah yeah i get it
1 u know is right
2) when two ethane radicals combine
3) when combination of ethane radical is chlorinated

Thanks a lot!! Appreciate it