MCQ
$(X)$ $\&$ $(Y)$ are


- AEnantiomers
- ✓Diastereomers
- C$E$ $\&$ $Z$ isomer
- DConstitutional isomer

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$CH_4(g) +2O_2(g) \rightarrow CO_2(g)+2H_2O(l)\,;$ $\Delta H= -890 \,kJ$
$CO_2(g) \rightarrow C($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$) \rightarrow C(g)\, ;$ $\Delta H= 716\, kJ$
Gas $(A)$ burns with a blue flame and is oxidised to gas $(B)$
Gas $(A) + Cl_2 \to (D)$
$A, B$ and $D$ are