What are the major steps(mechanism)in the formation of ortho,para substituted nitro phenol or 1,3-dinitro phenol from 1,3-dinitro chlorobenzene in the presence of Aq.NaOH at high temperature? Reference of question-IIST paper-2012.Please help.

'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