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Catalogs Discussion Forums -> Organic Chemistry -> dienes -> Go to message
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2 replies   
Only cumulated dienes have chiral centers(allenes). Odd no. of double bonds show geometrical isomerism while even number show optical activity
Catalogs Discussion Forums -> Organic Chemistry -> wats the compound???? -> Go to message
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7 replies   
Obviously D.B.=2
Catalogs Discussion Forums -> Organic Chemistry -> what is the productof the reaction CH2=CH2-Br + H2O = -> Go to message
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10 replies   
And even if ur right then CH2=CH-OH <-->CH3-CHO
Catalogs Discussion Forums -> Organic Chemistry -> what is the productof the reaction CH2=CH2-Br + H2O = -> Go to message
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Surely all vinylic halides do not undergo substitution. So addition is answer.
Probably,
CH2=CH-Br + H2O --> CH3-CH(Br)-OH
Catalogs Discussion Forums -> Organic Chemistry -> wats the compound???? -> Go to message
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7 replies   
2-butyne is wrong. No mono halogen derivative is optically active. So answer is cyclobutene.
Catalogs Discussion Forums -> Organic Chemistry -> Organic Conversion - Pls help Urgent -> Go to message
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17 replies   
Protect the aldehyde using glycol(converted into acetal).
Then reduce using LiAlH4 and finally hydrolyse to get the product.
Catalogs Discussion Forums -> Organic Chemistry -> REACTION MECHANISM-1 -> Go to message
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2 replies   
Generally regioselective and stereoselective reactions are same, i.e. A reaction in which a reactant gives 1 compound in higher yield than the other. If the product is a stereoisomer then it is stereoselective and if it is not then regioselective reaction.(E.g.:-Markownikoff addition to propene is regioselective and to styrene is stereoselective)
 
In a stereospecific reaction one stereoisomer will give another stereoisomer in higher yield(e.g.:- ANTI addition of Br2 on cis-2-butene). Whereas in regiospecific reactions the product is not chiral.
Catalogs Discussion Forums -> Organic Chemistry -> Aromaticity order -> Go to message
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16 replies   
Pyridine>thiophene>pyrrole>furan
 
Pyridine is obviously most arromatic because it directly has 6pi electrons and the arromaticity is increased by the hetero atom.
 
For the last three we need to decide upon the ease in which the lone pair is donated towards reasonance. So thiophene>pyrrole>furan.
Catalogs Discussion Forums -> Differential Calculus -> Limits::easy one::::.......... -> Go to message
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8 replies   
lim_{n\rightarrow \infty} \frac{1}{\sqrt{n}} \sum^{r=4n}_{r=1} \frac{1}{\sqrt{r}}

=lim_{n\rightarrow \infty} \frac{1}{n} \sum^{r=4n}_{r=1} \sqrt{\frac{n}{r}}

=\int_{0}^{4} \frac{1}{\sqrt{x}}\,dx

=4
Catalogs Discussion Forums -> Organic Chemistry -> CLEAR THE DIFFERENCE BETWEEN ANTI MARKOWNIKOFF RULE AND SAYTZEFF RULE. -> Go to message
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1 replies   
Markownikoff rule is w.r.t. to electrophilic substitution whereas
SAYTZEFF RULE is w.r.t. to elimination
Catalogs Discussion Forums -> Organic Chemistry -> what is the different between D&L( +&-) wlth exampls plz???? -> Go to message
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+ and - refer to the sign of rotation d- or l-
 
D- and L- refer to the position(left or right) of -OH or -NH2 on the last chiral carbon.
There are compounds which are D(-) and those which are L(+)
Catalogs Discussion Forums -> Organic Chemistry -> explain method with example -> Go to message
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1 replies   
Refer Morrison and Boyd and I.L.Finar for your doubt.
Catalogs Discussion Forums -> Differential Calculus -> Find the limit -> Go to message
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46 replies   
200% correct koni. U r really good.
 
By the way sandeep I am right only the 4th question is 1/e.
Catalogs Discussion Forums -> Algebra -> Find the area. Doubt?????? -> Go to message
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18 replies   
No nothing is mentioned. But I had the same doubt too.
Catalogs Discussion Forums -> Vectors -> if a b c are 3 vectors such that (b.c).a=(a.b).c . what does this imply? -> Go to message
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18 replies   
Yes correct.
 
 
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