When acetaldehyde is heated with Tollen’s reagent, which of the following is obtained?

Which of the following compounds will give positive test with Tollen’s reagent?

Which of the following will give yellow precipitate with ${\mathrm{I}}_{\mathrm{2}}/\mathrm{NaOH}$?    

Which of the reagent is used to convert $2-$butanone into propanoic acid?    

$\text{α, β}$-Unsaturated aldehyde is formed in the sequence

Consider the reactions:

$\left(\mathrm{i}\right)$ 

$\left(\mathrm{ii}\right)$ 

Identify $\mathrm{A}, \mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$.