Pentane has the molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{12}$. It has:

Which of the gases decolourise alkaline ${\mathrm{KMnO}}_4$ solution?

The heteroatoms present in

${\mathrm{CH}}_3—{\mathrm{CH}}_2—\mathrm{O}—{\mathrm{CH}}_2—{\mathrm{CH}}_2\mathrm{Cl}$ are

(i) oxygen                 

(ii) carbon

(iii) hydrogen           

(iv) chlorine

Structural formula of benzene is

The IUPAC name of the compound  is