MCQ
In graphite, electrons are
- ALocalised on every third $C$ atom
- BPresent in antibonding orbital
- CLocalised on each $C$ atom
- ✓Spread out between the structure
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$(1)$ $NaN{H_2};\mathop {C{H_3}}\limits^{{\text{a}}\,\,\,\,\,\,\,} C{H_2}Br$:${H_2},{\text{ }}\mathop {{\text{(one mole)}}}\limits^{\text{b}} {\text{ }}Pd{\text{ or }}Ni$
$(2)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:${H_2}{\text{ (two moles) }}Pd{\text{ or }}Ni$
$(3)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:${H_2},{\text{ (one mole) }}Pd{\text{ or }}Ni$
$(4)$ $NaN{H_2};C{H_3}C{H_2}C{H_2}Br$:$B{H_3},{H_2}{O_2},O{H^ - }$

| $\Delta H \,(kJ/mol)$ | |
| $\frac 12 A \rightarrow B$ | $+150$ |
| $3B \rightarrow 2C + D$ | $-125$ |
| $E + A \rightarrow 2D$ | $+350$ |
For $B + D \rightarrow E + 2C, \Delta H$ will be ............. $\mathrm{kJ/mol}$