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Why some compounds are undergoes dimerization ?

Compound are dimerized due to following reasons:
(1) If there is no steric crowding and back bonding in a molecules then bridge bond formed and molecules dimerised and stabilized and dimerisation are more stable than back bonding.
(2) Most of the electron deficient compound attains stability by performing back bonding or they undergo dimerisation provided certain conditions are fulfilled
(3) BCl3 ,BBr3 BI3 and B(Me)although  they are electron deficient compound but do not undergo dimerisation  because  of steric factor in demmeric formed

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