expert r requested to dont post direct ans becaz as we all know the ans explain the mechanism in easy step for

1- how phenyl isocyanide is prepared from aniline how xylene is prep from toluene

2- why and how alkyl, benzyl and allyl halides give ppt while aryl and vinyl halides dont give ppt explain the reason

What do you want to mean by “expert r requested to dont post direct ans becaz as we all know the ans explain the mechanism in easy step for”.
Please white in complete sentence, whether it is a suggestion, comment, or question.
 
Anyway due to paucity of time it would not be possible for us to solve all your queries. We are providing solution to one of your queries. Try solving the rest of the questions yourself and if you face any difficulty then do get back to us.
 
When aniline is treated with chloroform and anhydrous zinc chloride, aniline is transformed to phenyl isocyanide (scheme 1).  
 
When toluene is treated with methyliodide and anhydrous aluminium chloride (Friedel craft reaction) a mixture of ortho and para xylene is formed (scheme 2). 

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