Arrange the following substances in chronological order of their first synthesis in lab:1.Black gold2.Fullerene3.Graphene4.Kevlar Select correct answer from the codes given below:Select the correct answer from the code given below:

1. A

   1 2 3 4

   (a) 1 2 3 4. Black gold cannot lead: it is a 21st-century lab material, far after Kevlar and fullerene.

2. B

   4 2 3 1

   (b) 4 2 3 1. Kevlar (1965) then fullerene (1985) then graphene (isolated 2004) then black gold (IIT Madras, 2019). (b) Official key.

3. C

   2 4 3 1

   (c) 2 4 3 1. Fullerene before Kevlar is impossible: C60 is 1985, Kevlar is 1960s.

4. D

   4 1 2 3

   (d) 4 1 2 3. Inserts black gold second, decades too early.

Summary. Official key is (b). Lab chronology: Kevlar 1965, fullerene 1985, graphene 2004, black gold 2019. Code 4 2 3 1.