MCQ
Most stable carbocation among the following is
- ✓

- B

- C

- D${}^{\oplus} CH_3$




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$(I)$ ${H_2}(g) + \frac{1}{2}{O_2}(g) \to {H_2}O(l);$
$\Delta {H^o_{298\,K}} = - 285.9\,kJ\,mo{l^{ - 1}}$
$(II)$ ${H_2}(g) + \frac{1}{2}{O_2}(g) \to {H_2}O(g);$
$\Delta {H^o_{298\,K}} = - 241.8\,kJ\,mo{l^{ - 1}}$
The molar enthalpy of vapourisation of water will be.....$kJ\,mol^{-1}$
(Rounded off to the nearest integer)
(Mass of $Li ^{3+}=8.3$ mass of proton)
(Atomic mass : $Cl =35.5 \,amu , H =1\, amu$ )