- A

- ✓

- C

- D







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$A$. has been used in spaceship
$B$. has as efficiency of $40 \%$ to produce electricity
$C$. uses aluminium as catalysts
$D$. is eco-friendly
$E$. is actually a type of Galvanic cell only
(Plank's const. $ h = 6. \times 10^{-34}\, Js\,;$ mass of electron $= 9.1091 \times 10^{-31}\, kg\,;$ charge of electron $e= 1.60210 \times 10^{-19}\, C\,;$ permittivity of vaccum $\epsilon _0 = 8.854185 \times 10^{-12} \,kg^{-1} \,m^{-3} A^2$)

Reason $R:$ The increasing nuclear charge outweighs the shielding across the period.
In the light of the above statements, choose the most appropriate from the options given below:
$\begin{array}{*{20}{c}}
{C{H_3} - C = C{H_2}C{H_2}OH} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$ is