Trending @Infosys; I am in Infosys since 4 years also I was not in a good domain but I want to switch as Java Backend developer my current CTC is 5.5 lpa

But what if they question me that I am asking 120% hike

Tell that ur underpaid as per current industry standards and this is a good ask for the skills n exp u bring. U may give real or fake eg of ur frnd geeting similar pkg. At last it's company's decision. Get a decent first offer anyhow then play counter offer game.