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Straight Chain Hydrocarbons

a Propane and...

Question

(a) Propane and ethane are . (Homologous, isomers)

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Solution

Propane and ethane are homologous.

Homologous are a series of compounds differing from each other by a repeating unit, methylene bridge −CH $_{2}$ −

Isomers are compounds with the same chemical formula but different structures.

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Fill in the blanks.

(a) Propane and ethane are ..... (homologous, isomers)

(b) A saturated hydrocarbon does not participate in a/an ...... reaction. (substitution, addition)

(c) Succeeding members of a homologous series differ by..... ( $C H, C H_{2}, C H_{3}$ )

(d) As the molecular masses of hydrocarbons increase, their boiling points and melting points ....... (increase, decrease)

(e) $C_{25} H_{52}$ and $C_{50} H_{102}$ belong to .... homologous series. (the same, different)

(f) CO is an ...... compound. (organic, inorganic)

(g) The chemical properties of an organic compound are largely decided by the ..... and the physical properties of an organic compound are largely decided by the ...... (functional group, number of carbon atoms)

(h) CHO is the functional group of an ...... (alcohol, aldehyde)

(i) The root in the IUPAC name of an organic compound depends upon the number of carbon atoms in ......... (any chain, principal chain)

(j) But -1-ene and but -2-ene are examples of .... isomerism. (chain,position, functional)

Q. Why isomers are not possible for the first 3 saturated carbon compounds(methane, ethane,propane)?

Q. In addition to some propane and ethane, LPG cylinders contain mainly two isomers of another alkane. Name the two isomers and write their condensed structural formulae.

Q. Do ethane n propane can also be consider under isomers because there structural formula can be rearranged?

Q. How they are related ethane and propane

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Straight Chain Hydrocarbons

Standard XII Chemistry

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