Which of the following aqueous solutions is the best electrical conductor?

Which of the following is a poor conductor of electricity?

$A$ weak monobasic acid is $4\%$ dissociated in $0.05 \text{ M}$ solution. What is the percent dissociation in $0.1 \text{ M}$ solution (in $\%$)?

The degree of dissociation of $0.1 \ N$ $CH_3COOH$ is (given $K_a = 1 \times 10^{-5}$) approximately $......$

The equivalent conductance of benzoic acid is $12.8 \ ohm^{-1} \ cm^{2} \ eq^{-1}$. If the equivalent conductance of benzoate ion and $H^{+}$ ion at infinite dilution is $42 \ ohm^{-1} \ cm^{2} \ eq^{-1}$ and $288.42 \ ohm^{-1} \ cm^{2} \ eq^{-1}$ respectively,then its degree of dissociation is ............. $\%$

$A$ weak monobasic acid is $1\%$ ionised in $0.1 \ M$ solution at $25 \ ^{\circ}C$. The $\%$ ionisation in its $0.025 \ M$ solution is