Which of the following substances produces acetic acid upon fermentation?

$A$ 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?

In $CH_3CH_2OH$,which bond dissociates heterolytically?

Which of the following alcohols is used in beverages?

Major product $A$ is

The order of reactivity of the following alcohols with halogen acids is . . . . . .
$(A)$ $CH_3-CH_2-CH_2-OH$
$(B)$ $CH_3-CH_2-CH(OH)-CH_3$
$(C)$ $CH_3-CH_2-C(CH_3)_2-OH$