Question

Which one of the following contain (3c -2e) bonds?
$\left(i\right)B_2{H}_6,\left(ii\right)BeC{l}_2,\left(iii\right)Be{H}_2,\left(iv\right)A{l}_{2}C{l}_6$

• A. $\left(i\right),\left(ii\right)and\left(iii\right)$
  
• B. $\left(i\right)and\left(iii\right)$
  
  
• C. $\left(i\right),\left(ii\right)and\left(iv\right)$
  
  
• D. $\left(ii\right)and\left(iii\right)$
  
  

Answer 1

The correct option is B $\left(i\right)and\left(iii\right)$



1.
2.
3.
4.
In (i) and (iii) 3c-2e bonds are present and in (ii) 3c-4e bonds are present. In (iv), two dative bonds are present like $BeC{l}_2$, and thus it also contain 3c-4e bonds.