Which substance will give a positive iodoform test?

Fehling's solution '$A$' is

The product of the reaction is:

Identify the major product formed from the following reaction sequence:
$CH_3-CH=CH_2$ $\xrightarrow[(i) HBr]{(ii) NaOH}$ ${\xrightarrow[(iii) Cu/573 \ K]{(iv) Ba(OH)_2, \Delta}} ?$

Isobutyraldehyde on reaction with formaldehyde and $K_{2}CO_{3}$ gives compound '$A$.' Compound '$A$' reacts with $KCN$ and yields compound '$B$,' which on hydrolysis gives a stable compound '$C$.' The compound '$C$' is .... .

Which of the following statements are $TRUE$ about Haloform reaction?
$A$. Sodium hypochlorite reacts with $KI$ to give $KOI$.
$B$. $KOI$ is a reducing agent.
$C$. $\alpha, \beta$-unsaturated methylketone will give iodoform reaction.
$D$. Isopropyl alcohol will not give iodoform test.
$E$. Methanoic acid will give positive iodoform test.
Choose the correct answer from the options given below: