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cheMISTERY

cheMISTERY

by arvind ramachandran -
Number of replies: 7

1.C6H5COOH(in the para position-SO3H).Is it 4-sulpho benzoic acid (or) 4-carboxy sulphonic acid (or) 4- sulpho benzene carboxylic acid.

2.can anyone explain the baics of Keto-Enol tautomerism(Desmotropism)

3.the co-ordination number of Ni2+ is 4.

Nicl2+KCN(excess)---->A(cyano complex)

Nicl2+conc.Hcl(excess)--->B(chloro complex)

What is A and B. Can anyone explain me plz.....

In reply to arvind ramachandran

Re: cheMISTERY

by Ankul Garg -
Arvind,
The IUPAC name of C6H5COOH(para - SO3H) is 4-Sulpho benzene carboxylic acid because -COOH has greater priority than SO3H and in IUPAC nomenclature carboxylic acid of benzene is written as benzene carboxylic acid.

Tautomerism: It is a type of isomerism in which the atoms of the hydrocarbon rearrange themselves to form another substance with totally diff. properties without changing the molecular formula of the compound. For eg. in keto-enol tautomerism the alpha-H in ketones or in acetaldehyde goes to the O of carbonyl group(C=0) and thus forms hydroxyl group there and shifting the double bond to C=CH2. Thus, enol form of 2-Propanol is Prop-1-en-2-ol. The keto and enol forms remain in equilibrium with each other. But, generally keto form dominates over enol form.

For ur 3rd query i can't answer as i haven't read coordination no. yet.
In reply to Ankul Garg

Re: cheMISTERY

by arvind ramachandran -

yes you are right Ankul, but in some books they have given preference to sulphonic acid. Even my chemistry teacher gave preference to sulphonic acid by naming the compound as 4-carboxy benzene sulphonic acid.

So ,are you sure the answer is 4-sulpho benzene carboxylic acid???

By the way, thanks for your explanation for tautomerism.

In reply to arvind ramachandran

Re: cheMISTERY

by ann xavier -
But i read it in a well-known book to be named as 4-sulpho benzoic acid and not as 4- sulpho benzene carboxylic acid.
In reply to ann xavier

Re: cheMISTERY

by Ankul Garg -
Well that is a very controversial thing that has become very popular in chemistry these days. Nobody knows which naming to follow. But according to NCERT it is 4-sulpho benzene carboxylic acid and i think that also matches the IUPAC naming. After all we can't use trivial names in IUPAC. No need to go in great details it will remain controversial.