If 3-methyl-2-pentanol is heated with $conc.H_{2}S{O}_4,$ then the number of alkenes (including stereoisomers) is________

 



$IA$ can exist as $cis$  and $trans.$ 

$IB$ can exist as $d(+)$  and $l(-)$  due to presence of one chiral centre.

$IA$ and $IIA$  are same.
Thus, total number of alkene = 5
$IA(cis,trans)IB,(d-amdl-)andIIB.$