The most suitable reagent for the conversion of R - CH₂ - OH $$\to$$ R - CHO is:

Sodium phenoxide when heated with $$C{O_2}$$ under pressure at $${125^ \circ }C$$ yields a product which on acetylation products $$C.$$



The major product $$C$$ would be

In the reaction,

the product C is:

In S_N2 reactions, the correct order of reactivity for the following compounds:
CH₃Cl, CH₃CH ₂Cl, (CH₃)₂CHCl and (CH₃)₃CCl is: