$2 \mathrm{NH}_{3(\mathrm{g})} \rightarrow \mathrm{N}_{2(\mathrm{g})}+3 \mathrm{H}_{2}(\mathrm{g}) \Delta_{\mathrm{r}} \mathrm{H}^{\circ}=+91.8 \,\mathrm{kJ\,mol}^{-1}$
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$(a)$ $PCl_5$ form weak monobasic acid during hydrolysis
$(b)$ In $B_3N_3H_6$ nucleophile attack on $B-$ atom
$(c)$ $Al_2Cl_6$ is a polar and planar molecule
$(d)$ In $AlF_3$, hybridisation of $Al$ is $sp^2$
Statement $I :$ Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen atom.
Statement $II :$ Bohr'smodel of hydrogen atom contradicts Heisenberg's uncertainty principle.
In the light of the above statements, choose the most appropriate answer from the options given below :
$(i)\,\,RC \equiv \mathop C\limits^ \ominus $
$(ii)\,\,[IMAGE]$
$(iii)\,\,{R_2}C = \mathop C\limits^ \ominus H$
$(iv)\,\,{R_3}C - \mathop C\limits^ \ominus {H_2}$
From above data what is the molecular mass of $CH_4$ containing all isotopes of carbon but hydrogen on ${}_1^1 H$ ................ $\mathrm{u}$ (Given that atomic mass of hydrogen $= 1.008$)