1. Can a carboxylic acid be reduced by Hydrogen in presence of catalyst? If so, why do we convert it into ester before reduction with Hydrogen in presence of catalyst?

2. Why in Kolbe's reaction and Reimer-Tiemann reactions, ortho product predominates whereas in other reactions, para predominates?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane