How many isomer of ${\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}$ when react with $\mathrm{C}{\mathrm{H}}_3\mathrm{M}\mathrm{g}\mathrm{B}\mathrm{r}$ followed by acidification to give ${\text{2}}^{\text{o}}$ alcohol?

Alcohol $\stackrel{\text{Lucas reagent}}{\to }$Appearance of turbidity (or layer separation) after prolonged heating. How many of the following alcohols will give the above result when Lucas test is performed?

^{$\begin{array}{c}{\mathrm{CH}}_2\mathrm{OH}\\ | \\ {\mathrm{CH}}_2\mathrm{OH}\end{array}\underset{{\mathrm{H}}_2\mathrm{O}}{\overset{{\mathrm{HIO}}_4}{\to }}\mathrm{X}$} 

Find the number of moles of organic product $\text{'}\mathrm{X}\text{'}$ formed per mole of ethylene glycol.

How many of the following compounds are less acidic than phenol?

$\mathrm{m}-$nitrophenol, benzyl alcohol, $\mathrm{o}-$cresol, $\mathrm{o}-$chlorophenol, ethanol, picric acid, cyclohexanol

The number of benzene rings in the structure of phenolphthalein are

How many of the following alcohols are secondary in nature?

Butan$-2-\mathrm{ol}, 2,2$ -dimethylpropan$- 1 -\mathrm{ol}$, propan$-1,2-$diol,

methylpropan$-2-\mathrm{ol}$, propan$-1,3-$diol, propan$-2-\mathrm{ol}$, cyclobutanol,

$2-$methylcyclopentanol, propan$-1,2,3-$triol.

${\mathrm{RCH}}_2\mathrm{OH} + {\mathrm{CrO}}_3\stackrel{\mathrm{aq}. {\mathrm{H}}_2{\mathrm{SO}}_4}{\to } \mathrm{Z} + {\mathrm{Cr}}^{\mathrm{x}+}$

The oxidation number $\mathrm{x}$ of $\mathrm{Cr}$will be