Three molecules of acetone in the presence of dry $HCl$ form:

Give the conversion of the following:
$(i)$ $\text{Pent-3-en-2-one}$ from $\text{Ethanal}$
$(ii)$ $\text{Pent-2-enal}$ from $\text{Ethanal}$

What is used in the silvering of mirrors?

$A$ mixture of benzaldehyde and formaldehyde on heating with aqueous $NaOH$ solution gives:

Identify the product $P$ from the following sequence of reactions?

Identify the pair of compounds which can be distinguished by the iodoform test.