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(C) Due to its smaller size and unavailability of $d$-orbitals,boron exhibits properties that contrast with other elements of the boron family.$I$. Bo

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$III, IV$ only

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(C) Due to its smaller size and unavailability of $d$-orbitals,boron exhibits properties that contrast with other elements of the boron family.$I$. Boron trihalides do not form dimeric structures; they complete their octet through back bonding. Other members of this group can form dimeric structures.$II$. Boron does not show $+1$ as a stable oxidation state. As we move down the group,the stability of the $+1$ oxidation state increases due to the inert pair effect. The $+1$ oxidation state of Boron is highly unstable.$III$. The maximum covalency of Boron is four,as it lacks $d$-orbitals and cannot accommodate more than eight electrons in its valence shell.$IV$. Boron does not form $BF_{6}^{3-}$ ion because it cannot expand its octet beyond eight electrons.

List-$I$ (Compound)	List-$II$ (Property/Name/Structure)
$A$. $H_3BO_3$	$1$. Dimeric form
$B$. $AlCl_3$	$2$. Back bonding
$C$. $B_3N_3H_6$	$3$. Hydrogen bonding
$D$. $BF_3$	$4$. Inorganic benzene

Identify the correct statements about the anomalous behaviour of Boron:
$I$. Boron trihalides can form dimeric structures.
$II$. Boron shows $+1$ as a stable oxidation state.
$III$. Maximum covalency of Boron is four.
$IV$. Boron does not form $BF_{6}^{3-}$ ion.

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Match the following compounds in List-$I$ with their properties/names in List-$II$.
List-$I$ (Compound) List-$II$ (Property/Name/Structure)
$A$. $H_3BO_3$ $1$. Dimeric form
$B$. $AlCl_3$ $2$. Back bonding
$C$. $B_3N_3H_6$ $3$. Hydrogen bonding
$D$. $BF_3$ $4$. Inorganic benzene

Chemically,borax is:

Borax is converted into crystalline boron by the following steps :
$Borax$ $\xrightarrow{HCl} (X)$ $\xrightarrow{\Delta} B_2O_3$ $\xrightarrow{\Delta, Y} B$
Identify $X$ and $Y$ respectively.

The chemical name of borax is

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Identify the correct statements about the anomalous behaviour of Boron:$I$. Boron trihalides can form dimeric structures.$II$. Boron shows $+1$ as a stable oxidation state.$III$. Maximum covalency of Boron is four.$IV$. Boron does not form $BF_{6}^{3-}$ ion.