BCl_3 does not exist as a dimer but BH_3 exists as a dimer (B_2H_6) because:

JEE Main Chemistry question

does not exist as a dimer but exists as a dimer () because:

(A)Chlorine is more electronegative than hydrogen
(B)There is back bonding in but does not contain such multiple bondingCorrect
(C)Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted between boron atoms
(D)None of the above

Answer: (B)

Solution

In , a filled -orbital on each chlorine donates electron density into boron's empty -orbital ( back bonding), which largely satisfies boron's electron deficiency so that dimerisation is not required. Hydrogen

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Question ID VK-138503