MCQ
The $IUPAC$ name of${(C{H_3})_2}CH - C{H_2} - C{H_2}Br$ is
- A$1-$ bromo pentane
- B$2-$ methyl and $4$ bromo butane
- ✓$1-$ bromo and $3-$ methyl butane
- D$2-$ methyl and $3$ bromo propane
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$(I)$ they exhibit high enthalpies of atomisation as the $d-$ subshell is full
$(II)$ $zn$ and $Cd$ do not show variable oxidation states while $Hg$ shows $+ I$ and $+ II$
$(III)$ Compound of $Zn,\,Cd$ and $Hg$, are paramagnetic in nature
$(IV)$ $Zn,\,Cd$ and $Hg$ are called soft metals
