Methanol can be distinguished from ethanol by

Which of the following compounds are not oxidized by $HIO_4$?
$(1)$ $CH_3-CH(OH)-CH_2-OH$
$(2)$ $CH_3-C(=O)-CHO$
$(3)$ $CH_3-C(=O)-C(=O)-CH_3$
$(4)$ $CH_3-C(=O)-CH(NH_2)-CH_3$
$(5)$ Cyclohexene oxide
$(6)$ $CH_3-O-CH_2-CH_2-OH$
$(7)$ $HOOC-CH_2-OH$

Show the $\beta$-elimination reactions for the following alcohols:
$(i)$ Propyl alcohol
$(ii)$ Isopropyl alcohol
$(iii)$ Cyclohexanol
$(iv)$ Tertiary-butyl alcohol.

The following reaction is known as:
$C_2H_5OH + SOCl_2 \xrightarrow{\text{Pyridine}} C_2H_5Cl + SO_2 + HCl$

Out of $2$-chloroethanol and ethanol,which is more acidic and why?

Which product is formed when ethyl alcohol is heated with concentrated $H_2SO_4$?