Which biphenyl is optically active? I know that it can never be 1. I don't think it will be 4 either as I read that it should be ortho-substituted biphenyl. So, when I look at 2 and 3, I can't make out which one should be the correct answer. Should it always be two ortho substituents...

A transition metal can be defined as an element that possesses an incomplete sub-level in one or more of its oxidization states. In the textbook I'm reading, it claims that zinc is not a transition metal because it has a full $d$-sub-level in all its oxidization states. A quick google reveals th...

Over my usage of the site i have noticed many users specifically asking for references to literature where some physical property is listed for a particular compound. Many a times i have also seen multiple sites giving different values for the same property of a particular substance. I tried se...

If I'm not wrong, I learned in 2011 introduction to neuropsychology course that all enzymes are proteins. As far as I know, any protein, not even the smallest of the TAL group (which I understand to be the smallest currently known protein group), can be represented on a common-size two dimension...