Which compound can reduce Fehling reagent?

Which of the following compounds will give a positive iodoform test?

Schiff's reagent gives pink colour with

Explain the reactivity of nucleophilic addition reactions of aldehyde and ketone compounds.

Aldol condensation is a popular and classical method to prepare $\alpha, \beta-$unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?

Compound $P$ $(C_{8}H_{8}O)$ gives a red-orange precipitate with $2,4-DNP$ reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, $P$ gives an aromatic product $Q$ that produces effervescence on treating with aqueous $NaHCO_{3}$. Compound $P$ and $Q$, respectively, are: