MCQ
Product $Y$ is


- A

- B

- ✓

- D








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Statement $I$ : The metallic radius of $\mathrm{Na}$ is $1.86 \mathrm{~A}^{\circ}$ and the ionic radius of $\mathrm{Na}^{+}$is lesser than $1.86 \mathrm{~A}^{\circ}$.
Statement $II$ : Ions are always smaller in size than the corresponding elements.
In the light of the above statements, choose the correct answer from the options given below :
$\Delta H_{f({C_2}{H_2})(g)}^o\, = \,230\,kJ\,mo{l^{ - 1}}$
$\Delta H_{f({C_6}{H_6})(g)}^o\, = \,85\,kJ\,mo{l^{ - 1}}$
Calculate the standard heat of trimerisation of ethyne to benzene.
$3{C_2}{H_2}(g) \to {C_6}{H_6}(g)$
......$kJ\, mol^{-1}$
