Which of the following is least reactive?

Aldehyde and ketone undergo nucleophilic addition reaction because of polarity between gtC=O group . The reactivity of carbonyl groups toward nucleophile depends upon the nature of inductive effect of froup present at carbonyl carbon. Which of the following is least reactive for nucleophilic addition reaction

Which of the following shows least reactivity towards bormination ?

Which of the following is the least reactive element ?

Which one of the following is least reactive for hydrolysis reaction ?

Which of the following is the least reactive in the case of bromination ?

Which of the following is the least reactive towards nucleophile?

Which one of the following is least reactive compound for nulceophilic acyl aubstitution.