Which of the following substances will produce acetaldehyde in the presence of an aqueous solution?

Product $(C)$ is

Dehydrogenation of $CH_3-CH(OH)-CH_3$ gives

The compound which will give a negative iodoform test is

An organic compound $(A)$ (molecular formula $C_{6}H_{12}O_{2}$) was hydrolysed with dil. $H_{2}SO_{4}$ to give a carboxylic acid $(B)$ and an alcohol $(C).$ $C$ gives white turbidity immediately when treated with anhydrous $ZnCl_{2}$ and conc. $HCl$. The organic compound $(A)$ is

The compound which gives turbidity immediately with Lucas reagent at room temperature is