please provide the answer in detail. thank you!!!

2. (define rev (lambda (1) Note: Do not use the Scheme build-in function 3. Position of first occurrence of k in list (define positionof (lambda (k 1st) (positionof 'c (cbd c e f)) - 1 Note: You may want to define a helper function 2. (define rev (lambda (1) Note: Do not use the Scheme build-in function 3. Position of first occurrence of k in list (define positionof (lambda (k 1st) (positionof 'c (cbd c e f)) - 1 Note: You may want to define a helper function