Clemmensen reduction of a ketone is carried out in the presence of

The major product formed in the reaction is

Aldol condensation will not take place in

The reaction sequence is: Cyclopentene $\xrightarrow[Cold\, dil.]{KMnO_4 / OH^{-}} X$ $\xrightarrow{HIO_4} Y$ $\xrightarrow{OH^{-} / \Delta} Z$; $Z$ is

Tollen's reagent and Fehling solutions are used to distinguish between

Acetaldehyde forms a white crystalline precipitate on mixing with a ...... solution of