What is the pH of $\mathrm{HCl}$ solution when the hydrogen gas electrode shows a potential of $-0.59 \mathrm{V}$ at standard temperature and pressure?

What is the standard free energy change for the following reaction at room temperature? Is the reaction spontaneous? $(\mathrm{E}{°}_{\left({\mathrm{Sn}}^{2+}/\mathrm{Sn}\right) }= - 0.14 \mathrm{V} ; \mathrm{E}{°}_{\left({\mathrm{Cu}}^{2+}/{\mathrm{Cu}}^{+}\right)} = 0.15 \mathrm{V})$

$\mathrm{Sn}\left(\mathrm{s}\right) + 2{\mathrm{Cu}}^{+2} \left(\mathrm{aq}\right)\to {\mathrm{Sn}}^{2+} \left(\mathrm{aq}\right) + 2{\mathrm{Cu}}^{+} \left(\mathrm{s}\right)$

A hydrocarbon $\left(\mathrm{A}\right)$ with molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$ on ozonolysis gives two products (B) and (C). Both (B) and (C) give a yellow precipitate when heated with iodine in presence of $\mathrm{NaOH}$ while only (B) give a silver mirror on reaction with Tollen’s reagent. Identify (A), (B) and (C).

A hydrocarbon $\left(\mathrm{A}\right)$ with molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$ on ozonolysis gives two products (B) and (C). Both (B) and (C) give a yellow precipitate when heated with iodine in presence of $\mathrm{NaOH}$ while only (B) give a silver mirror on reaction with Tollen’s reagent. Write the reaction of B with Tollen’s reagent.

A hydrocarbon $\left(\mathrm{A}\right)$ with molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$ on ozonolysis gives two products (B) and (C). Both (B) and (C) give a yellow precipitate when heated with iodine in presence of $\mathrm{NaOH}$ while only (B) give a silver mirror on reaction with Tollen’s reagent. Write the equation for iodoform test for C.

A hydrocarbon $\left(\mathrm{A}\right)$ with molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$ on ozonolysis gives two products (B) and (C). Both (B) and (C) give a yellow precipitate when heated with iodine in presence of $\mathrm{NaOH}$ while only (B) give a silver mirror on reaction with Tollen’s reagent. Write down the equation for aldol condensation reaction of B and C.