Adding Column in R

[rachhitgarg]

I have two csv First & Second

First is having data

      V1 V2  V3  V4 V5

Row 1: 1 2 3 4 5

Row 2: 1 6 7

Second is having

     V1   V2

Row 1: A 1

Row 2: B 1

Row 3: C X

I want to compare Second[2] with First[1] if matches add Second[1] to column of First

like

First =

        V1  V2   V3   V4  V5  V6  V7

Row 1: 1 2 3 4 5 A B

Row 2: 1 6 7 A B