Question

According to $VSEPR$ theory the repulsion between different pair (lone or bond) of electrons obey the order
(I) lone pair-lone pair $>$ lone pair-bond pair
(II) lone pair-bond pair $>$ bond pair-bond pair
(III) lone pair-lone pair $>$ bond pair-bond pair
(IV) lone pair-bond pair > lone pair-lone pair

• A. $I,IIandIII$
• B. $IIandIV$
• C. $I,IIandIV$
• D. All

Answer 1

Answer: (A)

According to the V SEP R theory, lone pairs of electrons occupy more space than bonding pairs. As a consequence, this is an order of the magnitude of repulsion.
$lp-lp>lp-bp>bp-bp$
Greatest repulsion is between 2 lone pairs.
Followed by repulsion between one lone pair and one bonding pair. The weakest repulsion is between 2 bonding pairs, the magnitude of repulsion between bonding pairs of electrons depends on the $EN$ difference between a central atom and the other atoms.