MCQ
Which of the following is lewis acid
- ✓$BF_3$
- B$Cl^-$
- C$H_2O$
- D$NH_3$
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$C(g) + 4H(g) \to C{H_4}(g),\,\Delta H = - {x_1}\,k\,cal$
$C{H_4}(g) \to C{H_3}(g) + H(g),\,\Delta H = + y\,k\,cal$
The bond energy of $C - H$ bond is