MCQ
The electronic configuration of chromium is
- A$[Ne]\,3{s^2}3{p^6}3{d^4},4{s^2}$
- ✓$[Ne]\,3{s^2}3{p^6}3{d^5},4{s^1}$
- C$[Ne]\,3{s^2}3{p^6}3{d^6},4{s^1}$
- D$[Ne]\,3{s^2}3{p^5}3{d^5},4{s^2}$
$1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}3{d^5}4{s^1}$
( half filled $d $ orbital is more stable than incompletely filled $d $ orbital)
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$1.$ Boron is approximately $sp^3$ hybridized
$2.$ $B-H-B$ angle is $180^o$
$3.$ There are two terminal $B-H$ bonds for each boron atom
$4.$ There are only $12$ bonding electrons available
Of these statements
$1$ litre of mixture $X$ $+$ excess $BaC{l_2} \to Z$ Number of moles of $Y$ and $Z $ are
$\begin{array}{*{20}{c}}
{R = - CH - Cl}\\
{|\,\,}\\
{\,\,\,\,C{H_3}}
\end{array}\,\,\,\,,\,\,\,\,\,\,\,\,\,\,\begin{array}{*{20}{c}}
{S = - CH - Cl}\\
{|\,\,}\\
{Br}
\end{array}$
$(I)$ $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{C{H_3} - C{H_2} - O - S - C{F_3}} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O}
\end{array}$
$(II)$ $CH_3-CH_2-O-TsCl$
$(III)$ $\begin{array}{*{20}{c}}
{C{H_3} - CH - C{H_3}} \\
{|\,\,\,\,} \\
{OH\,}
\end{array}$
$(IV)$ $\begin{array}{*{20}{c}}
{C{H_3} - CH - OH} \\
| \\
{{C_6}{H_5}}
\end{array}$