MCQ
A certain orbital has no angular nodes and two radial nodes. The orbital is
- A$2\, s$
- ✓$3\, s$
- C$3\, p$
- D$2\, p$
$n-l-1=2$
$n-1=2$
$n =3$
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$(A)$ Emit or absorb energy in the form of electromagnetic radiation
$(B)$ Frequency distribution of the emitted radiation depends on temperature
$(C)$ At a given temperature, intensity vs frequency curve passes through a maximum value
$(D)$ The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature

| List$-II$ | List$-II$ |
| $(a)$ ${PCl}_{5}$ | $(i)$ Square pyramidal |
| $(b)$ ${SF}_{6}$ | $(ii)$ Trigonal planar |
| $(c)$ ${BrF}_{5}$ | $(iii)$ Octahedral |
| $(d)$ ${BF}_{3}$ | $(iv)$ Trigonal bipyramidal |
Choose the correct answer from the options given below.

$\begin{array}{*{20}{c}}
{C{H_3} - C - C - C{H_3}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{O\,\,\,\,\,\,\,\,\,O}
\end{array}$ $X$ in the above reaction is