
- A

- B

- ✓

- D








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$(A)$ Stereochemistry of addition - SYN ONLY
$(B)$ Regiochemistry of addition- ANTI-MARKOVNIKOV OR ANTI-MARKOVNIKOV LIKE


$CH_3-CH=O + C_6H_5-CH=O$ $\xrightarrow[\Delta ]{{\mathop O\limits^\Theta H(aq)}}$ $\mathop X\limits_{({C_4}{H_6}O)} $ $+$ $\mathop Y\limits_{({C_9}{H_8}O)} $
$A$. All the transition metals except scandium form $MO$ oxides which are ionic.
$B$. The highest oxidation number corresponding to the group number in transition metal oxides is attained in $Sc _2 O _3$ to $Mn _2 O _7$.
$C$. Basic character increases from $V _2 O _3$ to $V _2 O _4$ to $V _2 O _5$.
$D$. $V _2 O _4$ dissolves in acids to give $VO _4^{3-}$ salts.
$E$. $CrO$ is basic but $Cr _2 O _3$ is amphoteric.
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