MCQ
Addition of cold conc. $H _2 SO _4$ with alkenes is an example of
- Anucleophilic addition reaction
- Belectrophilic substitution reaction
- ✓electrophilic addition reaction
- Dnucleophilic substitution reaction
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$[HCl=36.5; {(N{H_4})_2}S{O_4}=132; N{H_3}=17]$
The number of compounds/species which obey Huckel's rule is $..........$
$(i)$ $6C(s) + 3{H_2}(g) \to {C_6}{H_6}(l);\,\Delta H = + 45.9\,kJ$
$(ii)$ ${H_2}(g) + \frac{1}{2}{O_2}(g) \to {H_2}O(l);\,\Delta H = - 285.9\,kJ$
$(iii)$ $C(s) + {O_2}(g) \to C{O_2}(g);\,\Delta H = - 393.5\,kJ$
........$kJ$