Chemistry: Post your doubts here!

[asd]

If we are to react CH3CH2CH=CH2 with Hot KMnO4, we'd get a carboxylic acid and CO2, right?

 

[A star]

If we are to react CH3CH2CH=CH2 with Hot KMnO4, we'd get a carboxylic acid and CO2, right?

hot acidified conc KMnO4 yes acid water and CO2

 

[Mohsin41]

Hello friends,
I have collected very usefull AS chenistry notes which are very easy to understand and revise. I have tried many times but due to large file size its not uploading here. If any one of you want topic or chapter notes you can contact me at [email protected]

REGARDS and good luck for paper2 on 8th may.

 

[aalmuhannadi]

But we use an acid in both the reactions, and the reaction is initiated by an H(with a slightly positive charge) atom attached to the acid. Will this, then, not be an electrophilic reaction?
Or is it that only addition/substitution reactions can be electrophilic or nucleophilic, and elimination can not be?
If so, reason please.
Cause we're still using an acid where the H atom can be considered as an electrophile.

I think the reason is that, firstly, yes the only types of electrophilic reactions (as far as I know) are addition and substitution. Secondly, I'll write an example of an elimination reaction with an alcohol:

CH3CH2CH2OH > CH3CH=CH2 + H2O , I took this from a book and clearly the concentrated H2SO4 isn't included as a reactant, so my logical explanation would be that the acid acts as a catalyst in this reaction.

 

[asd]

I think the reason is that, firstly, yes the only types of electrophilic reactions (as far as I know) are addition and substitution. Secondly, I'll write an example of an elimination reaction with an alcohol:

CH3CH2CH2OH > CH3CH=CH2 + H2O , I took this from a book and clearly the concentrated H2SO4 isn't included as a reactant, so my logical explanation would be that the acid acts as a catalyst in this reaction.

Well Look here: http://www.docbrown.info/page06/OrgMechs1b.htm#catalysed

 

[PhyZac]

bond polarity means what is the EN value difference of the bond . this will dictate bond strength and mp bp

High bond polarity= High bond energy= reduced bond length. This means the covalent bond is strong.

Thank you sooo much!!!!!

Jazakum Allah khairan!!! May Allah S.W.T bless you with the highest grades Aameen!!

 

[asd]

Thank you sooo much!!!!!

Jazakum Allah khairan!!! May Allah S.W.T bless you with the highest grades Aameen!!

No problemo
And you too, Ameen.

 

[syed1995]

i dont get it y am i the only person who finds chem easy and phy hard :/

You're not the only one. I find Physics difficult as compared to chemistry.

 

[syed1995]

just one off topic post all online pls reply
which pak uni are u guys going to apply to?

NUST or FAST most probably.. I don't really know which universities are good for Computer Sciences

 

[syed1995]

ohhh :O i started to feel scared from u

The knowledge he has.. I'd say he's one of them.. Stay away from him!

 

[badrobot14]

iKhaled and daredevil please do not go off-topic...

thanks,
XPC- POLICE..

 

[A star]

NUST or FAST most probably.. I don't really know which universities are good for Computer Sciences

my brother .

 

[syed1995]

my brother .

Brother?

What you taking .. and which university?

 

[A star]

Brother?

What you taking .. and which university?

u applying in same uni as me jst saying
but computer engineering is my second preference compard to mechanical

 

[daredevil]

iKhaled and daredevil please do not go off-topic...

thanks,
XPC- POLICE..

sorry but chem gets hectic after a while so got distracted
*hands up* sorry Inspector

 

[aleezay]

In the syllabus it is written explain the terms bond energy, bond length and bond polarity and use them to compare the reactivities of covalent bonds.

My doubt is, what does bond polarity do to covalent bond, like how does it affect it?

I think it makes a covalent bond stronger. And it makes a covalent compound more reactive..

 

[aleezay]

Does the solubility of group2 metal hydroxides increase or decrease down the group?

 

[PhyZac]

Does the solubility of group2 metal hydroxides increase or decrease down the group?

Thank you for your help, May Allah S.W.T bless you with highest results and have mercy on you and your family Aameen.

The solubility of hydroxide increase down the group.

read this to know more http://www.chemguide.co.uk/inorganic/group2/solubility.html

 

[A star]

increase slightly

 

[PhyZac]

increase slightly

Can you tell a nice answer to why.

Like, why does group2 hydroxide increase solubility while sulphate decrease ( I know about sulphate, but not hydroxide)?