Fluorination

Q.

In the combustion of methane, what is the limiting reactant and why?

Q. Propenenitrile (acrylonitrile) is used in the manufacture of synthetic fibres and nitrile rubber. It can be made from propane using the following gas phase reaction :
$C{H}_2=CH-C{H}_3+N{H}_3+3/2O_2\to C{H}_2=CH-CN+3H_{2}O$
Calculate (in kJ) values corresponds to the standard enthalpy change for this reaction? Assume that the combustion of both reactants and products yields $C{O}_2,H_{2}O$ and $N_2,$ and that the enthalpy changes of combustion are $\Delta H_c^{\Theta }[C{H}_2=CH-C{H}_3]=-2058.0kJmo{l}^{-1},\Delta H_c^{\Theta }\left[N{H}_3\right]=$
$-382.8kJmo{l}^{-1},\Delta H_c^{\Theta }[C{H}_2=CH-CN]=-1756.4kJmo{l}^{-1}$

Q. How many monochloro products are possible theoretically when n-hexane is treated with $C{l}_2$ in sunlight?

Q. Which of the following cannot be considered as a mechanistic step in chain reaction of methane with ${Cl}_2$?

1. ${Cl}_2⟶{Cl}^{\ast }$
2. ${CH}_4+{Cl}^{\ast }⟶{CH}_{3}Cl+H^{\ast }$
3. ${Cl}^{\ast }+{CH}_4⟶{CH}_3+HCl$
4. ${Cl}^{\ast }+{CH}_3⟶{CH}_{3}Cl$

Q. Two moles of helium gas undergo a reversible cyclic process as shown in figure. Assuming gas to be ideal, what is the net work involved in the cyclic process?

1. $-100Rln4$
2. $+100Rln4$
3. $+200Rln4$
4. $-200Rln4$

Q.

Direct Fluorination of methane is a laboratory is violently explosive. This is because the chain - initiation and chain-propagation steps are highly exothermic.

1. True

2. False

Q. Heterolysis of propane gives?

1. $\stackrel{\bullet }{C}{H}_3$ and $\stackrel{\bullet }{C_2}{H}_5$
2. $C{H}_3^{⨁}$ and $C_2^{⨁}{H}_5$
3. $C{H}_3^{\ominus }$ and $C_2^{⨁}{H}_5$
4. $C{H}_3^{⨁}$ and $C{H}_3^{+}$ and $C{H}_2^{-}$

Q.

Which of the following does not give formaldehyde on heating or distillation?

1. Formaline

2. Trioxane

3. Paraldehyde

4. Paraformaldehyde