Which of the following compounds does not undergo haloform reaction?

$C_6H_{12}O_6$ $\xrightarrow{\text{Zymase}} A$ $\xrightarrow[\Delta]{NaOI} B + CHI_3$
The number of carbon atoms present in the product $B$ is $.....$

When liquid $A$ is treated with a freshly prepared ammoniacal silver nitrate solution,it gives a bright silver mirror. The liquid forms a white crystalline solid on treatment with sodium hydrogensulphite. Liquid $B$ also forms a white crystalline solid with sodium hydrogensulphite but it does not give a test with ammoniacal silver nitrate. Which of the two liquids is an aldehyde? Write the chemical equations of these reactions also.

The appropriate reagent for the following transformation is

Which of the following statements is true regarding the Cannizzaro reaction?

Which of the following aldehydes gives a red precipitate with Fehling solution?