Chemistry: Post your doubts here!

[nehaoscar]

Why is D - the teritary one not affected by the OH concentration?

 

[nehaoscar]

Between what would forces 2 and 3 be?

 

[nehaoscar]

Doesn't K2Cr2O7 turn from orange to green ? (2) but only 1 is correct :?

 

[Mathemagical]

View attachment 54555
What would each give as a result with C?

SiO2 is acidic and will not react with hydrochloric acid.
Calcium carbonate will react with hydrochloric acid to form calcium chloride, carbon dioxide and water.

 

[Mathemagical]

View attachment 54556
Does LiAlH4 give nascent hydrogen?

LiAlH4 is commonly used as a reducing agent. In this case, it reduces the aldehyde into a primary alcohol.

 

[Mathemagical]

View attachment 54557
Why is D - the teritary one not affected by the OH concentration?

Since it is not affected by OH- ions, the reaction mechanism is Sn1. Only tertiary halogenoalkanes undergo Sn1 reactions.

 

[Mathemagical]

View attachment 54558
Between what would forces 2 and 3 be?

Permanent dipole would be C=O, and induced dipole would be C-N

 

[Mathemagical]

View attachment 54559
Doesn't K2Cr2O7 turn from orange to green ? (2) but only 1 is correct :?

The organic product is a carboxylic acid, which is not coloured.

 

[shazmina]

http://postimg.org/image/kv4auw8xd/full/
Can any1 please explain me why option 2 is not considered?

 

[nehaoscar]

SO2 + Ca(OH)2 ---> CaSO3 + H2O

Thats the main product formed initially
So is there a different final product?

 

[Mathemagical]

http://postimg.org/image/kv4auw8xd/full/
Can any1 please explain me why option 2 is not considered?

Option 2 is a salt, so it will be found in the flask. The question specifies on the distillate.

 

[qwertypoiu]

So even if they hadn't mentioned the product catalysing the reaction, the graph would still look the same as the reactants would eventually run out right.?

Then it would have been D

 

[qwertypoiu]

Can't we find moles like
vol given/24 .. i.e...(1/24 + 2/24)?

It may give you the correct final answer, however, technically that assumption is wrong, since 1 mole of gas occupies 24 litres only in room temperature and pressure

 

[nehaoscar]

Then it would have been D

Ah yes! And say if it was catalysed by a different catalyst... then it would be C right?

 

[nehaoscar]

How is 3 also correct?
V3+ = 20 electrons = 1s2 2s2 2p6 3s2 3p6 4s2 ... so it doesn't have unpaired electrons :/

 

[nehaoscar]

How to do?

 

[nehaoscar]

Why not the others? what would they give?

 

[qwertypoiu]

Ah yes! And say if it was catalysed by a different catalyst... then it would be C right?

If there was already a catalyst present, and the amount of catalyst remained the same, the shape would still be like that of D. Only the value of rate at specific timings would be different. (higher)

The thing with this question is that since the product themselves are catalysing the reaction, the amount of catalyst increases over time, instead of being constant.

 

[fantastic girl]

So the reagents could be PCl5 or SOCl etc...?

Yep only those particular ones

 

[nehaoscar]

How to do??