The correct statement about the synthesis of erythritol $(C {({CH}_{2} OH)}_{4})$ used in the preparation of PETN is:

A
The synthesis requires three aldol condensations and one Cannizzaro reaction.
B
Alpha hydrogens of ethanol and methanol are involved in the reaction
C
The synthesis requires two aldol condensations and two Cannizzaro reactions.
D
The synthesis requires four aldol condensations between methanol and ethanol

Solution:

Erythritol is synthesised as follows. This requires three aldol condensations and one Cannizzaro reaction.

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