Could you please provide a Python code for the following;

A. An iterative function of linear complexity (one while or for loop) that returns the sum of the first n positive odd numbers.

B. A recursive function that will check if a String is a palindrome.

C. Write functions to do an iterative linear search.

D. A function that recursively checks two lists for equality - in terms of their contents.

E. A merge sort function

F. Given a list of numbers, write a list comprehension that produces a list of each odd number doubled

G. Given a sentence in a file, produce a list of the lengths of each word in the sentence