MCQ
$Al_4C_3$ is an ionic carbide, named as
- AAcetylide
- ✓Methanide
- CAllylide
- DAlloy
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($A$) tetranuclear $\left[\mathrm{B}_4 \mathrm{O}_5(\mathrm{OH})_4\right]^{2-}$ unit
($B$) all boron atoms in the same plane
($C$) equal number of $s p^2$ and $s p^3$ hybridized boron atoms
($D$) one terminal hydroxide per boron atom
$B$ is

$(I)$ Acetaldehyde
$(II)$ Acetone
$(III)$ Di-tert-butylketone
$(IV)$ Methyl-tert-butyl ketone