Sulphurous Sisters !

Chemistry Level 3

Go through the following sequence of reactions, that produce sulphur ( $S$ ) and check which of the following statements are correct about them :

If saturated solution of Roll Sulphur( $S$ ) in $CS_{2}$ , is evaporated we get $A$ .
Molten rhombic sulphur is kept on a dish and is cooled till a crust is formed. On removing the crust, it forms needle shaped crystals of $B$ .
On chilling hot and concentrated solution of sulphur in solvents like $CS_{2}$ , $EtOH$ , or $Toluene$ we get $C$ .
On pouring $Na_{2}S_{2}O_{3}$ into conc. $HCl$ and extracting the product with $Toluene$ , we get $D$ .
At elevated temperatures around $\boxed{1000K}$ sulphur transforms to $E$ .

$Statements :$

$A$ forms a $S_{8}$ puckered crown shaped ring.
$B$ changes to $A$ upon heating above $\boxed{369K}$ , i.e; the Transition Temperature.
$A$ is the most stable form of sulphur at room temperature.
$C$ has a monoclinic structure and it looks like Mother of Pearl.
$C$ adopts a chair form of $S_{6}$ ring.
The variation of density is : $C$ $>$ $A$ $>$ $B$ .
$D$ can also be obtained by reaction between Tetrasulfane( $H_{2}S_{4}$ ) and Disulphur Dichloride( $S_{2}Cl_{2}$ ).
$E$ is a blue coloured, diamagnetic gas and it has same structural properties as $O_{2}$ .

$Note :$

Multiply the numbers preceding the statements which you think to be correct. For example : If you find statements 4,5,6,7 to be correct then enter : $4\times5\times6\times7$ $=$ $840$ .
$A,B,C,D,E$ all are different forms of Sulphur( $S$ ).

1 solution

Richeek Das
Apr 15, 2019

$A$ is $\alpha-Rhombic$ . It forms a $S_{8}$ puckered ring.
$B$ is $\beta-monoclinic$ and $\alpha-Rhombic$ forms $\beta-monoclinic$ on heating above 369K. It forms a $S_{8}$ puckered ring.
$C$ is $\gamma-monoclinic$ and statement 4 is correct. It forms a $S_{8}$ puckered ring.
$D$ is $\epsilon-Engel's$ $sulphur$ with cyclo- $S_{6}$ chair-form ring and statement 7 is correct.
$E$ is $S_{2}$ , a paramagnetic, blue gas with similar structural properties as $O_{2}$ .

Statements 1,3,4,6,7 are correct.