Overall, IR has contributed 3 "extraordinary" songs to Hindi films:

1. Chhahungi Tumko in Chhaila ( what an extraordinary way ahead of the Bollywood times "composition" but sadly unknown or uderrated contribution to Hindi music that sounded so Hindi like any other classic hindi song, and so modern jazz-pop like no other, terrific alapana and folkish charanam as well, just everything put in one song ( i think this could've been inspired by that "Girls just want to have fun" Cyndi Lauper)

2. Mastana, Mastana (Chahaila)
3. Aaj Bahua (a super holi song in Mahaadev)

few more strong compositions, though not really sounding like a Hindi song in spots:
Yeh Zindagi (Sadma) here, somehow I did not find a timbre or fluidity in the interesting Pallavi and also in the interludes - orchestration was mind blowing of course, I think it made up for the weakness in the Pallavi.
Jhosh Mein in Shiva (some editing required in Charanam)
Rhim Jim in Mahaadev ( some flaws in the tune, I thought, but great great song)
Jiske Sahara in Kamagni (plastic orchestration, but Pallavi is super, charanam somehow failed)
Ram Ram in Hey Ram
Aila Re - Mumbai Express