The most reactive compound towards cyanohydrin Formation is

The most reactive compound towards formation of cyanohydrin on treatment with KCN followed by acidification is

The most reactive compound towards formation of cyanohydrin on treatment with KCN followed by acidification is

For given reaction sequence: The most reactive compound towards electrophilic aromatic substitution is

For given reaction sequence: The most reactive compound towards electrophilic aromatic substitution is

Most reactive compound toward S_(N^1) is :

The most reactive compound towards Hofmann bromamide degradation is