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Organic Chemistry

Blazing goIITian

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18 Feb 2007 00:17:15 IST

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1)C-H bond distance is longest in C₂H₄ or C₂H₂Br₂Why? I possible explain with a diagram.

2)Among the following which 1 will get readily sulphonated

benzene, choro-benzene, nitro-benzene, or toluene.Why?

3)What r asymmetrical atoms?

Sorry for writing 3 ques at same time but plz answer.

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Comments (6)

Aditya Arora

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18 Feb 2007 01:01:22 IST

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1) C₂H₄ has a longer C-H bond length. This is because, in C₂H₂Br₂ , due to electron donating Br groups, electron density on carbon is higher due to which H sticks to it. Sorry, i coudn't make a diagram here.

2) Nitrobenzene because during sulphonation, the radical added is HSO₃^- . That is it would be attracted towards +ve charge. And nitrobenzene deactivates the benzene ring.

Look, all others (except benzene itself ) activate the benzene ring. So meta positions are less -ve. But nitrobenzene puts +ve charge on ortho, para making it more +ve and hence substitution is easy.

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20 Feb 2007 11:27:59 IST

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Dear Ashish,

I am sorry dude

, a rule is a rule, If experts answer your three questions on one page, other will come up with the same thing too. So please let us know which of these questions you want to be answered first and then post other queries on a new page

~ forum moderator

Ramya Hegde

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20 Feb 2007 15:29:26 IST

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Asymmetric compounds are those in which at least one chiral C-atom is present.

Bipin Dubey

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Joined: 23 Jan 2007

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24 Feb 2007 13:11:36 IST

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In case of CH₂Br₂ elctron donating group increses electron density on carbon atom and hence carbon attracts hydrogen atoms towards it.Hence bond length is higher for C₂H₄.

We are instructed to answer one query at a time.So please post your other queries on a new page.Hope you understand.

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youtune

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24 Feb 2007 13:31:44 IST

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the above first deals with the bromine atom being attached to the carbon atom. Wtih the br atom attached to the carbon there is parial positive charge on the carbon atom which causes the C-B bond lenght to decrease

ANIRUDH AVASARALA

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Joined: 18 Feb 2007

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25 Feb 2007 11:45:29 IST

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Hi,

Assymetrical atoms r those which have atleast one chiral carbon atom, or a carbon atom which has different groups attchd. 2 it. Assym. atoms can also be those atoms which are not superimposible when a mirror image of it has been taken. A perfect case can be that of Lactic Acid (C₃H₆O_{3 )}

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