OH H2CO OCH3 OH Combretastatirn H3co H3Co OF OCH3 OMe OH H3C

OH H2CO OCH3 OH Combretastatirn H3co H3Co OF OCH3 OMe OH H3Co OCH3 VI

Solution

In gneral trans alkenes are more stable than cis alkenes.

V and VI both are having double bond but V is cis alkene and VI is trans alkene. Trans alkene is more stable, so it is less reactive. Hnece VI is less reactive.

V is cis alkene and it has less stability when compare with VI so compound V is more reactiove than compound VI.