Which of the following compounds reacts with $NaOH$ to produce an acid and an alcohol?

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous $NaOH$ after heating gives $x$ as the major product. The number of $\pi$ bonds in the product $x$ is.................

The product of reduction of benzaldehyde is

Which of the following reagents would carry out the following transformation? ($D = $ $^2H$)

The reduction of carbonyl compounds with aluminum isopropoxide in excess of isopropanol is known as the Meerwein-Ponndorf-Verley $(MPV)$ reduction. What is the final product when cyclohex$-2-$enone undergoes selective reduction using this method?

Identify the correct option regarding the distinction between pairs of compounds.