Which of the following statements is/are true?

$\mathrm{\Delta }U=0$ for combustion of ${\mathrm{CH}}_4\left(\mathrm{g}\right)$ in a sealed rigid adiabatic container.

$\mathrm{\Delta }{H}_f$ for S(monoclinic) is non-zero 

If heat of atomisation of ${\mathrm{CH}}_4\left(\mathrm{g}\right)$ is 360 kcal/mole and $\mathrm{C}-\mathrm{C}$ bond energy is 60 kcal/mole then heat of atomisation of ${\mathrm{C}}_2{\mathrm{H}}_6$ is 600 kcal/mole

Work done may be zero in cyclic process