The reaction in an experiment is the Wittig synthesis of 1,4-Diphenyl-1,3-Butadiene, and one of the questions is:
In the reaction for this experiment, carbon is nucleophilic. Why is carbon not ordinarily nucleophilic?
What allows the carbon to remain in solution long enough to react in the way described by the Wittig reaction?

Explanation:

Due to the presence of phenyl groups and diene, the aromaticity prevails and the nucleophilic carbon becomes part of aromaticity which increases the stability of entire compound. Therefore, the nucleophic carbon is considered

the dependant variable is spilled water

the independent is the heat

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-