Are all carbon atoms in given compound in one plane?

${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

Are all carbon atoms in given compound in one plane?

Are all carbon atoms in given compound in one plane?

Are all carbon atoms in given compound in one plane?

$\mathrm{H}-\mathrm{C}\equiv \mathrm{C}-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}$

Are all carbon atoms in given compound lie in same plane?

Are all carbon atoms in given compound in one plane?

${\mathrm{CH}}_2={\mathrm{CH}}_2$

Are all carbon atoms in given compound in one plane?

${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2$

Are all carbon atoms in given compound in one plane?

Are all carbon atoms in given compound in one plane?