Bromobezene to benzoic acid . Convert …

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Bromobezene to benzoic acid . Convert it

Posted by Piyush K 7 years, 10 months ago

CBSE > Class 12 > Chemistry

6 answers

Prerna Pahwa 7 years, 10 months ago

Instead of KCN ,we can use CuCN to change in cynobenzene This rxn name is Rosenmund- von Braun Synthesis

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Kalindi Yadav 7 years, 10 months ago

The phenyl cation does not show resonance. Resonance is the delocalisation of π-electrons or lone pair electrons. It requires the interacting orbitals to be parallel so they can overlap. The π -electron cloud of phenyl carbocation is perpendicular to the vacant p-orbital of the carbocation. Therefore no overlap is possible and thus no resonance is possible. So when in a reaction if an intermediate is not stable then the reaction will not take place. It is very important that any reaction leads to a stabilized intermediates and then products. If stability is not present reaction will not happen.

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Kalindi Yadav 7 years, 10 months ago

No, we cannot react KCN with benzene and then to hydrolyze to form acid because in benzene substitution of -CN cannot takes place as the intermediate formed phenyl.

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Radhika Tyagi 7 years, 10 months ago

Prerna ka ans better h

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Prerna Pahwa 7 years, 10 months ago

. -Add KCN then complete hydrolysis

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Kalindi Yadav 7 years, 10 months ago

Conversion of bromobenzene to benzoic acid involves following steps Step -1:—Formation of toluene from chlorobenzene. Chlorobenzene and methyl chloride are reacted with sodium metal in presence of dry ether to form toluene. Step-2:—Oxidation of toluene to benzoic acid. Toluene is oxidised by alkaline KMnO₄ to form potassium benzoate,which on acid hydrolysis gives benzoic acid.

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