The effective factor in the preparation of alkene from alcohol using $Al_2O_3$ is ................ .

Compound $A$ of molecular formula $C_4H_{10}O$ on treatment with Lucas reagent at room temperature gives compound $B$. When compound $B$ is heated with alcoholic $KOH$,it gives isobutene. Compound $A$ and $B$ are respectively:

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
$(6)$ $CH_3-O-CH_2-CH_2-OH$
$(7)$ $HOOC-CH_2-OH$

Which among the following isomers of $C_4H_9OH$ has the lowest boiling point?

Explain the side effects of consuming denatured alcohol and its remedies.

The correct order of boiling point for primary $({1^o}),$ secondary $({2^o}),$ and tertiary $({3^o})$ alcohols is