1. Give the correct IUPAC name for the following 2. Give the E and Z structures

Question

1. Give the correct IUPAC name for the following 2. Give the E and Z structures of 4-ethyl-3-heptene compound (be sure to designate Z/E isomerism where appropriate). and designate which is E and which is Z. 3. Arrange the following alkenes in order of decreasing stability (most stable first to least stable last) (B) CH3CH CH2CH-CH2 (D) CH3CH2CH2CH-C(CH3)2 (A) Z-CH3CH2CH-CHCH3 (C) E-CH,CH2CH-CHCH A>B>C>D D>A>B>C D>C>B>A B>D>C>A 4. When trans-2-methylcyclohexanol (A) is subjected to acid catalyzed dehydration the major product is 1- methylcyclohexene 85% Ibro, However, when trans-1-bromo-2-methylcyclohexane (B) is subjected to dehydrohalogenation, the major product is 3- methylcyclohexene. Eadp Explain.

Explanation / Answer

Ans 1 :

To name the organic compound according to the IUPAC nomenclature , start by identifying the longest parent hydrocarbon chain. Then identify the functional and substituent groups and number them such that each of them get the least possible carbon numbering.

So the name of the compound will be :

(2E,4E)4-Methyl-3-phenyl-hepta-2,4-diene

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