Which of the following is the correct nucleophilic substitution ?

Which one of the following is most reactive in nucleophilic substitution ?

Which of the following is more active in a nucleophilic substitution reaction :-

Which of the following does not give nucleophilic substitution with alcohol :

Which of the following compounds give a nucleophilic substitution reaction with phosphorus pentachloride?

Which of the following compounds undergo nucleophilic substitution reaction