Acylation

Relative reactivity of carbonyl compounds towards nucleophile? 1) Acyl halide > Acid anhydride > Aldehyde > Carboxylic acid. 2) Carboxylic acid > Aldehyde > Acid anhydride > Acyl halide. 3) Acyl halide > Aldehyde > Acid anhydride > Carboxylic acid. 4) Acid anhydride > Acyl halide > Carboxylic acid > Aldehyde.

Which of the following cannot be acylated ?

Acyl nucleophilic substitution (SNAC) (SNAE)

Among the following, which one is acylic polyther?

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