MCQ
$IUPAC$ name of


- A$2,6,6-$ Trimethylbicyclo$[1.1.3]$hept $-2 -$ ene
- B$2,2,6-$ Trimethylbicyclo$[3.1.1]$hept $-5 -$ ene
- ✓$2,6,6-$ Trimethylbicyclo$[3.1.1]$hept $-2 -$ ene
- D$2,7,7-$ Trimethylbicyclo$[3.1.1]$hept $-2 -$ ene


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| Period number | Group number | |
| $P$ | $2$ | $15$ |
| $Q$ | $3$ | $2$ |
Then formula of the compound formed by $P$ and $Q$ element is
$H - C\, \equiv CH\,\xrightarrow[{(ii)\,C{H_3}C{H_2}Br}]{{(i)\,NaN{H_2}\,/\,liq.\,N{H_3}}}\,X$
$\xrightarrow[{(ii)\,C{H_3}C{H_2}Br}]{{(i)\,NaN{H_2}\,/\,liq.\,N{H_3}}}\,Y$
$X$ and $Y$ are