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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.

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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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.