00:01
Hello, good evening student.
00:04
So in this question we have to tell which is optically active.
00:07
So for optically active, molecule should have, molecule should have chiral center.
00:29
Okay, what is chiral center? sp3 hybridized carbon with all four different groups.
00:37
Sp3 carbon with all four different groups.
00:50
Okay? like this one, right? and molecule should not have, should not have, should not have, should not any symmetry element.
01:15
So now let's move to the options.
01:17
So in option a, we have butane.
01:22
Okay.
01:23
So, butane is something like this, cs3, ch2, ch2 and cs3.
01:29
So here, no chiral center.
01:35
Remember the definition of chiral, you can see the definition of chiral center from here.
01:40
All four difference, there should be a single, at least one carbon where all the four different groups are attached.
01:48
In this no carbon is present which have all four different groups.
01:52
So no chiral center, no optical activity...