Consider the following reactions:

$$\begin{gathered} \mathrm{X} + \mathrm{HCl} \underset{\left(\mathrm{Addition}\right)}{\overset{\mathrm{Anhydrous} {\mathrm{AlCl}}_3}{\to }} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl} \\ \underset{\left(\mathrm{Substitution}\right)}{\overset{\mathrm{Ahydrous} {\mathrm{ZnCl}}_2/ \mathrm{HCl}}{\leftarrow }} \mathrm{Y} \end{gathered}$$

Y can be conserted to X on heating with ....... at ...... temperature :

• Al₂O₃, 350°C

• Cu, 300°C

• Ca(OH)₂+ CaOCl₂, 60°C

• NaOH/I_2, 60°C

When acetylene is passed through red hot iron tube, compound X is formed. Which one  of the  following reactions will yield X as the major product?

• ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{OH} +\mathrm{Zn} \stackrel{\mathrm{Distillation}}{\to }$

• ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{SO}}_3\mathrm{H} +{\mathrm{NaHCO}}_3 \to$

• ${\mathrm{C}}_6{\mathrm{H}}_{12} + 3{\mathrm{H}}_2 \stackrel{\mathrm{Ni}}{\to }$

• ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl} + {\mathrm{H}}_2\mathrm{O} \stackrel{∆}{\to }$

13.

2, 3-dimethyl hexane contains...... tertiary ....... secondary and ......  primary carbon atoms, respectively:

• 2,2,4

• 2,4,3

• 4,3,2

• 3,2,4

Which of the following reactions proceeds via a secondary free radical?

• ${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2 \stackrel{\mathrm{HBr}}{\to } {\mathrm{CH}}_3-\mathrm{CHBr}-{\mathrm{CH}}_3$

• ${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2 \underset{\mathrm{UV} \mathrm{light} }{\overset{\mathrm{HBr}}{\to }} {\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2\mathrm{Br}$

• ${\mathrm{C}}_6{\mathrm{H}}_6 \stackrel{{\mathrm{Br}}_2/{\mathrm{FeBr}}_3}{\to } {\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Br}$

• ${\mathrm{C}}_6{\mathrm{H}}_6 \underset{\mathrm{UV} \mathrm{light} }{\overset{{\mathrm{Br}}_2}{\to }} {\mathrm{CH}}_3-{\mathrm{Br}}_2$

Water is considered to be polluted if the dissolved oxygen D.O. content is less than ....  ppm

• 5

• 10

• 15

• 100

A mixture of sodium oxide and calcium oxide are dissolved in water, and saturated with excess carbon dioxide gas. The resulting solution...... is It contains ....... :

• basic; NaOH and Ca(OH)₂

• neutral; Na₂CO₃ and CaCO₃

• Basic; Na₂CO₃ and CaCO₃

• Acidic; NaOH and Ca(OH)₂

Which one of the following is correct about stability of the given ions?

• Pb²⁺ > Pb⁴⁺

• Pb⁴⁺ > Pb²⁺

• Si²⁺ > Si⁴⁺

• Sn⁴⁺ > Sn²⁺

Sulphur trioxide is dissolved in heavy water to form a compound X. The hybridisation state of sulphur in X is :

• sp²

• sp³

• sp

• dsp²

What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?

• MgO, H₂O, CO₂

• Mg(HCO₃)₂, H₂O

• Mg(OH)₂, H₂O

• Mg, CO₂, H₂O

Consider the following reaction equilibrium:

${\mathrm{N}}_2\left(\mathrm{g}\right) +3{\mathrm{H}}_2\left(\mathrm{g}\right) \rightleftharpoons 2{\mathrm{NH}}_3\left(\mathrm{g}\right)$

Initially, 1 mole of N₂ and 3 moles of H₂ are taken in a 2 L flask. At equilibrium state if, the number of moles of N₂ is 0.6, what is the total number of moles of all gases present in the flask?

• 0.8

• 1.6

• 3.2

• 6.4