MCQ
The element having very high ionization enthalpy but zero electron affinity is
- A$H$
- B$F$
- ✓$He$
- D$Be$
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| $\Delta H \,(kJ/mol)$ | |
| $\frac 12 A \rightarrow B$ | $+150$ |
| $3B \rightarrow 2C + D$ | $-125$ |
| $E + A \rightarrow 2D$ | $+350$ |
For $B + D \rightarrow E + 2C, \Delta H$ will be ............. $\mathrm{kJ/mol}$
$trans-3$ -hexene $\xrightarrow{(b)}$ meso $3,4-$ hexanediol
Choose pair of reagent $(a, b)$ for above conversions

