When a mixture of ethanol and methanol is heated in the presence of concentrated $H_2SO_4$,the resulting organic product or products is/are:

Which of the following compounds will undergo a Friedel-Crafts alkylation reaction?

In the given reaction sequence,identify the correct reagents to prepare $A$ from $B$. The starting material is benzenesulfonic acid. The reaction with $\Delta / H_3O^+$ yields $B$ (benzene),and the reaction with $1. \text{Fused } NaOH, 2. H^+$ yields $A$ (phenol). Therefore,to prepare $A$ (phenol) from $B$ (benzene),the correct sequence of reagents is:

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Phenol $\rightarrow$ Salicylaldehyde	$I$. $Br_2$ in $CS_2$
$B$. Phenol $\rightarrow$ Benzene	$II$. $Na_2Cr_2O_7/H_2SO_4$
$C$. Phenol $\rightarrow$ $p$-Benzoquinone	$III$. $Zn$
$D$. Phenol $\rightarrow$ $p$-Bromophenol	$IV$. $CHCl_3/NaOH$

Choose the correct answer from the options given below:

Natalite is a mixture of

Which of the following substances does not dissolve in a sodium carbonate solution?