Treatment of cyclopentanone with methyl lithium gives which of the following species?

Give the major organic product of the following reaction.

Which of the following compounds undergoes the highest degree of enolization?

Among the following,the order of reactivity towards nucleophilic addition is:

Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions.
$(i)$ Ethanal,Propanal,Propanone,Butanone.
$(ii)$ Benzaldehyde,$p-$Tolualdehyde,$p-$Nitrobenzaldehyde,Acetophenone.
Hint: Consider steric effect and electronic effect.

Tischenko reaction is a modification of