Which is used as an antifreeze?

For the given reaction,if the final product is a mixture of $C_4H_8Br_2$ isomers,what is the value of $X$ (the number of alkenes formed in the mixture)?

Explain the reactions of alcohol compounds involving the cleavage of the $C-O$ bond.

Iodoform can be obtained on warming $NaOH$ and iodine with:

The main product of the following reaction is:
$C_6H_5-CH_2-CH(OH)-CH(CH_3)_2 \xrightarrow{conc. H_2SO_4} ?$

The relative rate of acid-catalyzed dehydration of the following alcohols would be: