question_answer

IUPAC name of the compounds   [AIPMT 1998]

A) trans-3 iodo- 4 chloro-3-pentene

B) cis-2-chloro-3-iodo-2-pentene

C) trans-2-chloro-3-iodo-2-pentene

D) cis-3-iodo-4-chloro-3-pentene

Correct Answer: C

Solution :

[c] In these groups preferential order is  and Hence, more preferential order containing groups are attached in opposite sides. So it is E (trans) isomer. Thus its name is trans-2-chloro-3-iodo-2-pentene.