Chemistry: Post your doubts here!

[nehaoscar]

When does it undergo elimination?
Is it when free radical is formed? or when Cr2 bond is broken?

 

[nehaoscar]

How is it 1... are the ones marked in red not all chiral centres? :/

 

[nehaoscar]

Why C?

 

[nehaoscar]

Why is 2 incorrect?

 

[nehaoscar]

Why is 3 wrong?
Can't it be made in a single reaction by blue + red (reactants) to form 3??

 

[fantastic girl]

View attachment 54481
Why would B - reducing the concentration increase the yield?

we are altering the original experiment
so originally there was 0.1 moles
now when we used 0.1 mol/dm3 we hve 0.01 moles
overall the moles are 0.11 --- which is higher than original so more collisions nd all that

 

[fantastic girl]

View attachment 54508
Why is 3 wrong?
Can't it be made in a single reaction by blue + red (reactants) to form 3??

which reaction is that ? :S
the one u mentioned

 

[fantastic girl]

View attachment 54507
Why is 2 incorrect?

hydrazine has N-N single bonds not triple

 

[fantastic girl]

View attachment 54506
Why C?

only in C the Cl has disappeared since C-Cl bond is the weakest

 

[nehaoscar]

which reaction is that ? :S
the one u mentioned

Aldehyde + HBr (D represents the isotope deuterium of H)
Is there such a reaction??

 

[fantastic girl]

View attachment 54485
??

for the mercury level to rise on the right side we need a high pressure frm X
1 - when the temperature is increased , forward reaction is favored so we get more gases which leads to greater pressure being exerted by X
2 - backward reaction is favored nd nothing will happen here since we get the same gas wid same moles
3 - obv wrong

 

[fantastic girl]

Aldehyde + HBr (D represents the isotope deuterium of H)
Is there such a reaction??

OMG no :O

 

[nehaoscar]

OMG no :O

haha ok! Thanks! So it will be addition with NaBH4 first and then nucleophilic subs so 2 steps yeah?

 

[fantastic girl]

View attachment 54486
When does it undergo elimination?
Is it when free radical is formed? or when Cr2 bond is broken?

is the answer A ?

 

[nehaoscar]

is the answer A ?

Yes...

 

[fantastic girl]

Yes...

yes thats ryt
alkyl halides undergo reduction nd nucleophilic substitution
nd this same compound can undergo further substitution so that more bromine gets added
reduction reaction takes place when alkyl halides react wid NaOH in ethanol under reflux to form alkene

 

[fantastic girl]

View attachment 54504
How is it 1... are the ones marked in red not all chiral centres? :/

no the two red spots on the benzene ring isnt chiral....carbon is attached to 3 different groups not four

 

[nehaoscar]

no the two red spots on the benzene ring isnt chiral....carbon is attached to 3 different groups not four

It will be attached to a H right?

 

[fantastic girl]

It will be attached to a H right?

No C can only form four bonds
two already there due to double bond , one is attached to other carbon nd last bond to O
draw the structure of it if ur confused

 

[hassannouman]

yes thats ryt
alkyl halides undergo reduction nd nucleophilic substitution
nd this same compound can undergo further substitution so that more bromine gets added
reduction reaction takes place when alkyl halides react wid NaOH in ethanol under reflux to form alkene

Halogenoalkanes undergo Elimination/Dehydration and Nucleophilic substitution. When adding KOH in ethanol (reflux), it forms alkene (elimination reaction) , NaOH in ethanol (reflux) can be used but our teacher preferred to use KOH always, with NaOH in water (reflux) it forms alcohol which is Nucleophilic substitution