Chemistry: Post your doubts here!

[MysteRyGiRl]

for question 40 :
the last option is incorrect so it has to be 1 & 2
2 because a salt is formed and 1 because alcohol is formed with the (OH) from (NAOH)
for question 28 :X contains nine carbon atoms and reacts with 2,4-dinitrophenylhydrazine reagent.
3 DNP are required to react with 9 carbon atoms

yes but why 3?can u plz explain?

 

[msohiabch]

For those who gave the paper today. what was the answer of organic mcq. where they asked about compund X??

it was C the alcohol

 

[MysteRyGiRl]

guyz could u plz not discus ur answers here?

 

[Most_UniQue]

it was C the alcohol

I dont remember that X thing question. But dont discuss the answers here.

 

[busy bee]

yes but why 3?can u plz explain?

u need to draw the structure first and then react it with DNP then it'll all be clear

 

[MysteRyGiRl]

^umm ok thnx wil try now

 

[MysteRyGiRl]

u need to draw the structure first and then react it with DNP then it'll all be clear

ohh i read the complete question nowi suck thanx

 

[busy bee]

ohh i read the complete question nowi suck thanx

ur welcome
not all carbon atom will have a ketone group attached

 

[busy bee]

it was C the alcohol

wat variant did u ppl get ?

 

[MysteRyGiRl]

got it

 

[Goku]

Most of the answers were C right?

 

[msohiabch]

wat variant did u ppl get ?

paper 12 whats yours??

 

[MysteRyGiRl]

how do u get 2 know the variants :S

 

[msohiabch]

how do u get 2 know the variants :S

it was paper 1 and the second digit tells the variant 1, 2 or 3

 

[busy bee]

paper 12 whats yours??

variant 11...
how was it?

 

[MysteRyGiRl]

variant 11...
how was it?

is ur ppr ovr??

 

[msohiabch]

variant 11...
how was it?

hmm it was good. not very difficult nor easy. you can say and average paper. i suppose that gt for this one would be round about 30 .
i got 2 3 mcqs wrong...

 

[Duamask]

Guys, for a good paper performance, Approximately How many past papers should be practiced?

 

[Duamask]

hmm it was good. not very difficult nor easy. you can say and average paper. i suppose that gt for this one would be round about 30 .
i got 2 3 mcqs wrong...

for Chemistry?

 

[msohiabch]

Guys, for a good paper performance, Approximately How many past papers should be practiced?

for chemistry your concepts must be great that is all you need. and its best to do 2004 -2011 papers if not possible then latest 2 3 years are sufficient..