Haloalkanes and...

The first steps of $${SN}^{1}$$ and $${SN}^{2}$$ reactions are, respectively:

Which one of the following compounds gives $${S_N}{1}, {S_N}{2}$$ and $${S_N}{2'}$$ mechanisms?

Nitration of xylene gives only one mono-nitro derivative. Which xylene is it?

By which mechanism does the above reaction proceed?

The chemical reaction:
$${ \left( { CH }_{ 3 } \right)  }_{ 3 } CBr \xrightarrow [ { -H }_{ 2 }O,-KBr ]{ KOH(alc.) }  { \left( { CH }_{ 3 } \right)  }_{ 2 }C={CH}_{2}$$ is an example of:

$${C}_{3}{H}_{7}Cl \xrightarrow [  ]{ KOH(alc.) }  (A) \xrightarrow [ 770K ]{ { Cl }_{ 2 }(g) }  (X)$$. $$(X)$$ can be:

$$\underset { Specific\quad rotaion=+{ 50 }^{ o } }{ Ph-CH(OH){ CH }_{ 3 } } \xrightarrow [  ]{ SO{ Cl }_{ 2 } } \quad \underset { |\\ Cl }{ PhCl } -{ CH }_{ 3 }$$
Which of the following mechanisms does the reaction proceed?

Ethanol $$\xrightarrow [  ]{ { P }_{ 4 }/{ I }_{ 2 } }  (X) \xrightarrow [ (ii)HBr ]{ (i)KOH(alc.) }  (Y)$$
In this sequence of reaction , $$(Y)$$ is:

$${C}_{6}{H}_{5}Cl \xrightarrow [ 625K, \ 300atm ]{ NaOH(aq.) } $$ 

Which of the following is called Westron?