MCQ
An ester can be prepared by the reaction of:
- ATwo alcohols
- BAn alcohol and an aldehyde.
- ✓An alcohol and an organic acid.
- DAn acid and a ketone
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Complexes : $\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+},\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ and $\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$
$\quad\quad\quad\quad\quad\quad A\quad\quad\quad\quad \quad B\quad\quad\quad\quad\quad\quad C\quad\quad\quad\quad\quad\quad D$
Choose the correct option:
$A$ and $B$ are :