3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

$(A)$ The total number of stereoisomers possible for ${X}$ is $6$

$(B)$ The total number of diastereomers possible for ${X}$ is $3$

$(C)$ If the stereochemistry about the double bond in ${X}$ is trans, the number of enantiomers possible for ${X}$ is $4$

$(D)$ If the stereochemistry about the double bond in ${X}$ is cis, the number of enantiomers possible for ${X}$ is $2$

$CH_4(g) +2O_2(g)  \rightarrow  CO_2(g)+2H_2O(l)\,;$  $\Delta H= -890 \,kJ$

$CO_2(g)  \rightarrow  C($graphite$) + O_2(g) \,;$   $\Delta H= 393 \,kJ$

$2H_2O(l)  \rightarrow  2H_2(g) + O_2(g) \,;$  $\Delta H= 571 \,kJ$

$2H_2(g) \rightarrow  4H(g)\, ;$  $\Delta H= 871\, kJ$

$C($graphite$)  \rightarrow  C(g)\, ;$  $\Delta H= 716\, kJ$