Question

plzz solve questions no. 5th

Answer 1

Homologous series is a series of organic compounds differing by a CH2 group. The difference between the mass of two consecutive members of Homologous series is 14u.

At room temperature, alkanes from C 1 to C 4 are gases and from C 5 to C 16 they are liquids. So, C5H10 is a liquid and C4H8 is a gas. It is common sense, that gases have low boiling point than liquids.

Increasing order of boiling point:
C3H6<C4H8<C5H10

Answer 2

(i) Homologous series:
A Homologous Series is a group of organic chemical compounds, usually listed in order of increasing size, that have a similar structure (and hence also similar properties) and whose structures differ only by the number of CH₂ units in the main carbon chain.

(ii) The melting and boiling points of C₅H₁₀ is higher than C₄H₈.
It is because with increase in molecular mass, in the physical properties there will be a gradual change (i.e) It goes higher in the attachment of atoms.

(iii) Increase in Boiling points:
C₃H₆ → C₄H₈ → C₅H₁₀
It is because increase in atomic mass makes the compounds stronger to break.


:) Hope this Helps !!!