Lucas test is associated with

Which of the following is called the Lucas reagent?

The iodoform reaction is given by all of the following,except:

Treatment of a $2^{\circ} \text{ alcohol}$ with $CrO_3/H_2SO_4$ yields a/an

$A$ compound with formula $C_4H_{10}O$ on oxidation gives $C_4H_8O$,which forms an oxime and gives a positive iodoform test. The original compound on reaction with concentrated $H_2SO_4$ gives $C_4H_8$. What is the structure of the compound?

Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?