Identify the product $A$ in the following reaction:

Identify the products of the following reaction: $HCHO + C_6H_5CHO \xrightarrow[ii) H_3O^{+}]{i) conc. NaOH} \text{Products}$

What type of product is obtained when formaldehyde reacts with $CH_3MgBr$ in dry ether?

When $CH_3COCH_3$ reacts with $Cl_2$ and $NaOH$,which of the following is formed?

In the following reaction:
$HC \equiv CH \xrightarrow[{Hg^{2+}}]{{H_2SO_4}} 'P'$
Product $'P'$ will not give:

Compound '$A$' (molecular formula $C_3H_8O$) is treated with acidified potassium dichromate to form a product '$B$' (molecular formula $C_3H_6O$). '$B$' forms a shining silver mirror on warming with ammoniacal silver nitrate. '$B$' when treated with an aqueous solution of $H_2NCONHNH_2 \cdot HCl$ and sodium acetate gives a product '$C$'. Identify the structure of '$C$.