** Rail Vikas Nigam RAIV.NS, Kaynes Technology KAYN.NS and three other stocks jump as NSE announces derivatives contracts
** RAIV jumps 9.2%; top midcap .NIFMDCP100 gainer on the day
** Stock set for biggest daily pct gains in nearly three months
** Mankind Pharma MNKI.NS up 4.2%; top gainer among pharma stocks .NIPHARM
** KAYN adds 5.5%
** Bharat Dynamics BARA.NS and Mazagon Dock Shipbuilders MAZG.NS up 0.8% and 0.3%, respectively; gains capped after defence stocks eased following Friday's sharp rally amid India-Pakistan conflict
** Futures and options contracts on the five stocks will be available from May 30, NSE says
(Reporting by Vivek Kumar M)
((VivekKumar.M@thomsonreuters.com;))