Answer Posted / swapna

Terpenoids are made up of varying number of respective
units called isoprene units(C5H8).this is isoprene rule.


Isoprene spatial type of arrangement is found to be present
in nearly all terpenoids.
Ingold in 1925 formulated this observation underanother
rule the SPECIAL ISOPRENE RULE.


According to this rule isoprene units in terpenoids are
usually joined in head-tail linkages or 1,4 linkages.
(branched end of isoprene unit considered as head.

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