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Nomenclature of Alcohols

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Question

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

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Solution

The root in the IUPAC name of an organic compound depends upon the number of carbon atoms in the principal chain.

The Word Root of IUPAC name indicates the number of carbon atoms in the longest possible continuous carbon chain also known as parent chain or principal chain.

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(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. The number of carbon atoms in the principal carbon chain of the given compound in its IUPAC name will be:

Q. The various steps for writing the IUPAC name of a saturated hydrocarbon is given below.
1) Identify the substituent groups if present any.
2) Numbering of carbon atoms in principal chain in which the substituent groups will have the lowest number.
3) Select the longest chain of carbon atoms.
4) Naming of the root word can be predicted from the number of carbon atoms present in the principal chain.
5) Suffix will be -ane and prefix will be named according to the substituents.
Which of the given arrangements describes the correct order?

Q. The number of carbon atoms in the principal chain of the given compound are :

Q. How many carbon atoms are present in principal chain as per IUPAC rule?

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Nomenclature of Alcohols

Standard XII Chemistry

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