What are the products formed in the following reaction?
$CH_3CH_2CHO + 2Cu^{2+} + 5OH^{-} \rightarrow X + Y + 3H_2O$

Give the conversion of the following:
$(i)$ $but-2-enal$ from $ethanal$
$(ii)$ $Methyl$ $benzoate$ from $benzaldehyde$

Given below are two statements:
Statement $I$: Cross aldol condensation between two different aldehydes will always produce four different products.
Statement $II$: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only.
In the light of the above statements, choose the correct answer from the options given below:

In the given Cannizzaro reaction,the slowest step is:
$2PhCHO \xrightarrow{KOH} PhCH_2OH + PhCOO^-$

The product $(A)$ of the following reaction is:

In the given reaction: $C_6H_5-COCH_3 \xrightarrow[(ii) H^{+}]{(i) Br_2/KOH} CHBr_3 + [X]$,$[X]$ will be: