Which of the following organic compounds exhibits positive Fehling test as well as iodoform test?

Given below are two statements:
Statement $I:$ The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole-dipole interactions.
Statement $II:$ The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of $H$-bonding.
In the light of the above statements,choose the most appropriate answer from the options given below:

When acetaldehyde is heated with Fehling solution,it gives a red precipitate of:

Clemmensen reduction involves the conversion of $ >C=O $ to $ >CH_2 $ in the presence of:

Which of the following compounds is highly reactive towards $HCN$?

$CH_3-CH(OH)-CH_2-CH_2-CO-CH_3 \rightarrow CH_3-CH(OH)-(CH_2)_3-CH_3$
The above conversion can be achieved by: