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thank u sir

what u wanna knw???

sir, someone named "cutey" is giving me salutes without any reason, moreover he/she hasnt posted a single post ....kindly check!!

Sir, can we hav a seperate place on the forum, where we can find all the useful links of the web, for studies. thr are many of them, n we all then can hav sth like online web pages for study..... and links for online tests, quizzes etc etc.. its jst a suggestion,

u can also see it on http://www.chem.ucalgary.ca/courses/351/Carey/Useful/hyperconjugation.html

Hyperconjugation in organic chemistry is the stabilizing interaction that results from the interaction of the electrons in a sigma bond (usually C-H or C-C) with an adjacent empty (or partially filled) non-bonding p-orbital or antibonding pi orbital to give an extended molecular orbital that increases the stability of the system. Only electrons in bonds that are ? to the positively charged carbon can stabilize a carbocation by hyperconjugation.

Hyperconjugation can be used for rationalizing a variety of chemical phenomena, including the anomeric effect, the gauche effect, the rotational barrier of ethane, the beta-silicon effect, the vibrational frequency of exocyclic carbonyl groups, and the relative stability of substituted carbocations. Hyperconjugation has also been shown to be the correct explanation for the preference of the staggered conformation rather than the old textbook notion of steric hindrance

yupp its magiclko,

...

next hmmm... tuff job, ... anyone whose online now

... may be priyanka

thank u ma'm

but what is the effect of presence of electron withdrwaing or releasing grp in the ring???

yeah its a jee2006 question and the answer to this is Zn(OH)₂....

when excess of ammonium chloride is added in presence of ammoniumhydroxide, it forma a complex, giving white ppt of tetraammine zinc(II)

Zn ²⁺ + NH₄OH --------> [Zn (NH)₃] ²⁺

it forms a complex, as the reagents are in excess....

ur welcome meghna,

btw thr's a website for all these... www.mathworld.wolfram.com.... u will find almost evrything related to maths here.... perhaps this will help u

btw can i expect ur rate for my post???

m afraid KAB...u r bit wrong, no doubt fluorine is most electro-ve,... but i think, its not the right reason,.... newayz, lets wait for experts to answer

hiiiiiiiiiii.............

well its o-chlorophenol....

The one having a weaker conjugate base will be a stronger acid. If the conjugate base has to be weak, then the negative charge has to be delocalised to a larger extent. In orthocholorophenol the C - Cl bond has partial double bond character, moreover due to tha presence of vacant orbitals in chlorine, the -ve charge is delocalised to a gr8r extent. the same cant take place in Fluorine, as it doesnt hav vacant orbitals, So o-chlorophenol is having a weaker conjugate base, and thus is a stronger acid.....

Hopefully u would hav got the reason........waise why have u gone crazy

thank u sir

shakir is absolutely right...... after converting cyclohexane to benzene, do diazotisation n then hydrolysis, phenol will be formed

hey meghna its not in jee syllabus, but still since u hav asked, this is all i hav found about it, i hope this will help u a bit atleast

The (complete) gamma function

is defined to be an extension of the factorial to complex and real numbers arguments. It is related to the factorial by

The gamma function can be defined as a definite integral for

(Euler's integral form)

			(3)
			(4)

or

integrating above equation by parts for a real argument, it can be seen that

If

is an integer

, 2, 3, ..., then

so the gamma function reduces to the factorial for a +ve integer argument.