Which one of the following is not formed when acetone reacts with $2-$pentanone in the presence of dilute $NaOH$ followed by heating?

Which of the following reactions will give $\alpha$-hydroxy acid as a product?

What are $A, B, C$ and $D$ in the following cross-aldol condensation reaction?
$\text{Propanal} + \text{Ethanal} \xrightarrow[ii) \ \Delta]{i) \ NaOH} A + B + C + D$
(The products are the four possible $\alpha,\beta$-unsaturated aldehydes formed by self and cross-aldol condensation followed by dehydration.)

The correct order of decreasing value of $K_{eq.}$ for the addition of $HCN$ to the following carbonyl compounds is:

Reactant	$K_{eq.}$
$PhCHO$	$a$
$CH_3CH_2COCH_3$	$b$
$PhCOCH_3$	$c$
$CH_3CHO$	$d$

What are $X$ and $Y$ respectively in the following set of reactions?

Which of the following carbonyl compounds gives both Fehling's test and iodoform test?