$(a)$ Secondary alcohol $\xrightarrow[\Delta]{H_3PO_4}$
$(b)$ Tertiary alcohol $\xrightarrow[\Delta]{H_3PO_4}$
For the above dehydration reaction,the rate of reaction will be:

For the following reaction,select the statement that best describes the change.
$RCH_2OH + PCC [ C_5H_5NH^{+} ClCrO_3^- ] \to$

Which of the following reactions requires an oxidising agent?

The reagent used to convert allyl alcohol to acrolein is:

In the following reaction,$Ethyl \ alcohol$ (in excess) $+$ $H^{+}$ (from $H_{2}SO_{4}$) $\xrightarrow{413 \ K}$ product,the product is

Consider the following alcohols. The order of decreasing reactivities of these alcohols towards substitution with $HBr$ is:
$(I)$ $C_6H_5CH_2OH$
$(II)$ $p-NO_2-C_6H_4CH_2OH$
$(III)$ $p-CH_3O-C_6H_4CH_2OH$
$(IV)$ $p-Br-C_6H_4CH_2OH$