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Chemistry: Post your doubts here!

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Thnx............. :)
So we always start the numbering from the other functional group rather than the double bond? Ryt?
Yea,the substituent gets named first, next the double bond, then hydroxyl group ...
But we number the carbons so that hydroxyl group gets the lowest number possible
 
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Thnx............also is the cis - trans isomerism the same as EZ isomerism?

Cis-trans and EZ are both geometrical isomers but are not the same.

Cis-trans is more specific, it requires at least 2 out of the 4 groups (at the C=C) to be identical to each other. ClCH=CHCl or ClCH=CHBr

EZ is more general, it can consist of 4 different groups. ClCH3C=CHBr
 
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When I solve recent years past papers that is from 2007 to 2015(summer) summer and witner both I use to score always above 50. Now when I look into old years like this paper I ended up at the score of just 46. I have so many doubts in this paper. If anyone can help me out solving, Q1(c)(d), Q2(c)(d), Q5(c), Q7(b)(c) in Q7(b) arent answer in ms for uses of esters? Please do it as soon as possible. Also, When I was solving papers I found that mostly moles thingy are in summer papers, in winter papers its mostly inorganic part and theory. Am I correct? Should I expect 2015 november paper to be easier with moles thingy??

Thank you,
Regards,
XPC member,
The Sarcastic Retard
 
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Cis-trans and EZ are both geometrical isomers but are not the same.

Cis-trans is more specific, it requires at least 2 out of the 4 groups (at the C=C) to be identical to each other. ClCH=CHCl or ClCH=CHBr

EZ is more general, it can consist of 4 different groups. ClCH3C=CHBr
Oooohkaaaayyy! I get it now.............thnx for replying and taking out ur time though.........:)
 
Messages
2,206
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2,824
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273
When I solve recent years past papers that is from 2007 to 2015(summer) summer and witner both I use to score always above 50. Now when I look into old years like this paper I ended up at the score of just 46. I have so many doubts in this paper. If anyone can help me out solving, Q1(c)(d), Q2(c)(d), Q5(c), Q7(b)(c) in Q7(b) arent answer in ms for uses of esters? Please do it as soon as possible. Also, When I was solving papers I found that mostly moles thingy are in summer papers, in winter papers its mostly inorganic part and theory. Am I correct? Should I expect 2015 november paper to be easier with moles thingy??

Thank you,
Regards,
XPC member,
The Sarcastic Retard
No one knows this?? Metanoia awesomaholic101
 
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Anyone please give me "Average isotopic mass" definition & tollen's reagent result... is it "silvery mirror formed" or "silvery mirror ppt." ?
 
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Anyone please give me "Average isotopic mass" definition & tollen's reagent result... is it "silvery mirror formed" or "silvery mirror ppt." ?
From where did u got a phrase like Avg. isotopic mass?
The colourless solution produces a grey precipitate of silver, or a silver mirror on the test tube.
 
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