Method of preparation of haloarenes by electrophilic substitution reaction

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Q. Which of the following is not an electrophilic substitution reaction of haloarenes?

Q. Order of rate of electrophilic substitution reaction is:

Q. Give reasons:
''The presence of nitro group

(- N O_{2})

at ortho/para positions increase the reactivity of haloarenes towards nucleophilic substitution reaction''.

Q. Which of the following undergoes electrophilic substitution reaction?

Riemer Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below

The electrophile in this reaction is

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