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Which nomencl...

Question

Which nomenclature is correct?---

a) 1,6-dimethylcyclohex-1-ene

b) 2,3-dimethylcyclohex-1-ene

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Solution

Always Number the chain from the end that produces the lowest set of locants (numbered positions) for the functional groups and substituents

The compound is named as 1,6-dimethylcyclohex-1-ene rather than 2,3-dimethylcyclohex-1-ene since the locant set ‘1,6’ is lower than ‘2,3

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Q. For a diagram The IUPAC name of the compund is given as 1,6-Dimethylcyclohex-1-ene. Why can't it be 2,3 Dimethylcyclohex-1-ene?
Is it because the substitutuion should get the least number?

n- Octane in the presence of Cr₂O₃/Al₂O₃ at 873K changes to

Q. Considering the following alkenes:

But-1-ene (i) 2, 3 - D i m e t h y l b u t - 2 - e n e (i i) 2-Methylbut-2-ene (i i i) 2-Methylpropene (i v)

The order of stability is

Q. Assertion :2,3-Dimethylbut-2-ene is more stable than but-2-ene. Reason: Six hyperconjugation structures can be written for 2,3-dimethylbut-2-ene while but-2-ene has twelve.

Q. Ozonolysis of

2, 3 -

- 1 -

ene followed by reduction with zinc and water gives:

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