In which of following compounds lone pair of oxygen is delocalized?

In which of the following compounds the lone pair is not delocalised over the benzene ring ?

In which of the following compounds is there the least delocalization of the lone pair of electrons on the nitrogen atom?

In which of the following compounds, delocalized bonding is not possible?

Which of the following pair of compounds is a pair of enantiomers

In which of the following cases lone-pair is involved in resonance :

Which of the following is a pair of peroxy compounds?

Which of the following pairs of compounds are not isomers?