Fehling solution is

Benzaldehyde reacts with ammonia to form

The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits

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 reaction of an aldehyde with hydroxylamine gives a product which is called

Which compound undergoes the iodoform reaction?