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

Arrange the following alcohols in increasing order of reactivity towards elimination reaction:
$(I)$ $NO_2-CH_2-CH_2-CH_2-CH_2OH$
$(II)$ $CH_3-CH_2-CH(NO_2)-CH_2OH$
$(III)$ $CH_3-CH(NO_2)-CH_2-CH_2OH$
$(IV)$ $CH_3-CH_2-CH_2-CH_2OH$
Select the answer from the codes given below:

Identify the major product of the following reaction:
$(CH_3)_3C-CH(OH)-CH_3 \xrightarrow[\Delta]{\text{conc. } H_2SO_4} \text{Major product}$

Which of the following shows the Lucas test instantaneously?

When the product formed by the reaction of $1-$methylcyclohexene with $H_3O^+$ is treated with Lucas reagent,when does turbidity appear?

$CH_3 CH_2 OH \underset{\text{step-}1}{\stackrel{Cl_2}{\longrightarrow}} CH_3 CHO$ $\underset{\text{step-}2}{\stackrel{3 Cl_2}{\longrightarrow}} Cl_3 CCHO$
In the above reactions,the role of $Cl_2$ in step-$1$ and step-$2$ respectively is: