The correct order of increasing polarizing power is:

C s^{+} > R b^{+} > K^{+} > N a^{+}

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B e^{2 +} > M g^{2 +} > C a^{2 +} > S r^{2 +}

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B a^{2 +} > S r^{2 +} > C a^{2 +} > M g^{2 +}

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L i^{+} > N a^{+} > K^{+} > R b^{+}

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Solution

The correct options are
A $L i^{+} > N a^{+} > K^{+} > R b^{+}$
B $B e^{2 +} > M g^{2 +} > C a^{2 +} > S r^{2 +}$
$P o l a r i s i n g p o w e r α \frac{c h a r g e}{s i z e}$
Less size has more polarising power
The atomic radius increases down the group. Thus the correct order of polarizing power can be given as follow:
$\Rightarrow {B e}^{+ 2} > {M g}^{+ 2} {> C a}^{+ 2} > {S r}^{+ 2} \Rightarrow {L i}^{+} > N a^{+} > K^{+} > {R b}^{+}$

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The correct order of increasing polarizing power is:

The correct options are A Li+>Na+>K+>Rb+ B Be2+>Mg2+>Ca2+>Sr2+Polarising power α chargesizeLess size has more polarising powerThe atomic radius increases down the group. Thus the correct order of polarizing power can be given as follow:⇒Be+2>Mg+2>Ca+2>Sr+2⇒Li+>Na+>K+>Rb+