How to repeatedly swap elements in scala list?

Question

I have a List

val a= List(1,2,3,4,5,6,7)

I want to consecutive swap the elements How can I do this?

Expected ans is

List(2,1,4,3,6,5,7)

Answer 1

scala> List(1,2,3,4,5,6,7).grouped(2).flatMap(_.reverse).toList
res10: List[Int] = List(2, 1, 4, 3, 6, 5, 7)