Its D because
Li = 6
Be =9
C= 12
O=15
Atomic number
atomic mass
group|family
periods
and element symbols
Because anymore water will breakdown the bonds of your Oh groups
FeCl₂ + 2NH₄OH → Fe(OH)₂ + 2NH₄Cl
The compound contains an ester functional group.
An ester is a carbonyl (C=O) group with an alkyl (R) group on one side and an alkoxy (OR) group on the other.
We write the <em>condensed structural formula</em> of an ester as R(C=O)OR or RCOOR.