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p-Block Elements - I
easy
$BCl_3$ does not exist as dimer but $BH_3$ exist as dimer $(B_2H_6)$ becuase
A
Chlorine is more electronegative than hydrogen
B
There is $p\pi -p \pi $ back bonding in $BCl_3$ but does not contain such multiple bonding
C
Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogenatoms get fitted between boron atoms
D
none of these
Solution
Large sized chlorine atoms do not fit in between the small baron atoms whereas small sized hydrogen atoms get fitted in between boron atoms so $BCl _3$ does not exist as dimer but $BH _3$ exist as dimer $\left( B _2 H _6\right)$.
$B _2 H _6+ H _2 O \stackrel{\text { Cold is enough }}{\longrightarrow} H _3 BO _3+6 H _2$
Standard 11
Chemistry
