Issue configuring Apache for Redirection

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Apache

Hello everyone;

I have a site on apache and have a problem I cannot sort out.

Section 1: The following work as expected

1. http://www.x.com/ redirects to https://www.x.com/ 
2. http://www.x.com/a/ redirects to https://www.x.com/a/
3. http://www.x.com/a/b/ redirects to https://www.x.com/a/b/

Section 2: The following give error

4. http://www.x.com/a 
5. https://www.x.com/a 
5. http://www.x.com/a/b 
6. https://www.x.com/a/b 

Section 3: What I need is the following (In addition to Section 1)

7. http://www.x.com/a redirects to https://www.x.com/a/
8. http://www.x.com/a/ redirects to https://www.x.com/a/ (This is same as 2 and already works)
9. http://www.x.com/a/b redirects to https://www.x.com/a/b/
10. http://www.x.com/a/b/ redirects to https://www.x.com/a/b/ (This is same as 3 and already works)

Any help or pointer appreciated. In response please indicate if change is required in .htaccess or apache2.conf.

Thanks
I.