Chemistry NCERT Exemplar Solutions Class 12th Chapter Twelve

Identify A in the given reaction.

When neopentyl alcohol is heated with an acid, it slowly converted into an 85:15 mixture of alkenes $\mathrm{A}$ and $\mathrm{B}$ , respectively. What are these alkenes?

For the equilibrium $A\rightleftharpoons B$ , the variation of the rate of the forward (a) and reverse (B) reaction with time is given by:

An organic compound (A) (molecular formula ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_2$ ) was hydrolysed with dil. ${\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4$ to give a carboxylic acid (B) and an alcohol (C). ' $C$ ' gives white turbidity immediately when treated with anhydrous ${\mathrm{Z}\mathrm{n}\mathrm{C}\mathrm{l}}_2$ and conc. $\mathrm{H}\mathrm{C}\mathrm{l}$ . The organic compound $\left(\mathrm{A}\right)$ is:

The ionic radii of ${\mathrm{O}}^{2-},{\mathrm{F}}^{-},{\mathrm{N}\mathrm{a}}^{+}$ and ${\mathrm{M}\mathrm{g}}^{2+}$ are in the order:

$\left[\mathrm{P}\right]$ on treatment with ${\mathrm{B}\mathrm{r}}_2/{\mathrm{F}\mathrm{e}\mathrm{B}\mathrm{r}}_3$ in ${\mathrm{C}\mathrm{C}\mathrm{l}}_4$ produced a single isomer ${\mathrm{C}}_8{\mathrm{H}}_7{\mathrm{O}}_2\mathrm{B}\mathrm{r}$ while heating $\left[P\right]$ with sodalime gave toluene. The compound $\left[P\right]$ is:

The correct structure of product 'A' formed in the following reaction,  is

At $20.0\mathrm{m}\mathrm{L}$ solution containing $0.2\mathrm{g}$ impure ${\mathrm{H}}_2{\mathrm{O}}_2$ reacts completely with $0.316\mathrm{g}$ of ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4$ in acid solution. The purity of ${\mathrm{H}}_2{\mathrm{O}}_2$ (in %) is (mol. wt. of ${\mathrm{H}}_2{\mathrm{O}}_2=34$ ; mol. wt. of ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4=158$ ) 

The number of chiral centres present in $\left[\mathrm{B}\right]$ is

The mass of ammonia in grams produced when $2.8\mathrm{k}\mathrm{g}$ of dinitrogen quantitatively reacts with $1\mathrm{k}\mathrm{g}$ of dihydrogen is(Mole Concept)