Question

Give structural formulas of the alkenes
expected
to form by the dehydrohalogenation
of
following compounds with a strong base:
(1)1 - Chloropentane
(2)2- Choro-3-methyl butane
(3)1- Chloro - 2,2-dimethyl propane.
​

Answer 1

Answer:

The reactions are given above:

(i) 1-methylcyclohexene is the major product.

Only one alkene is formed at beta H atoms on either side of Br atoms are equivalent.

(ii) 2-methyl-2-butene is the major product.

Two different alkenes are formed. More substituted alkene is the major product as it is more stable. This is in accordance with Saytzeff's rule.

(iii) 3,4,4-Trimethylpent-2-ene is the major product.

Two different alkenes are formed. More substituted alkene is the major product as it is more stable. This is in accordance with Saytzeff's rule.

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