"it takes a great deal of bravery to stand up to our enemies but just as much to stand up to your friends" what you you think he meant by that

I think that he meant that it may be hard to face your enemies, people you hate, yet it may be even harder to face your friends, because you care about them. 

I think it is hard to face your friends because you know them. You usually want to please them. If they want you to do something they are not comfortable with , and you do not want to that is called " peer pressure ".

It’s obvious the asnwer is false

Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.