The correct statement about the synthesis of erythritol (C(CH₂OH)4) used in the preparation of PETN is :

Which compound would give $$5$$ - keto - $$2$$ - methylhexanal upon ozonolysis?

In the following sequence of reactions:


The product C 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