A reaction of benzonitrile with one equivalent CH₃MgBr followed by hydrolysis produces a yellow liquid "P". The compound "P" will give positive _________.

The spin only magnetic moments (in BM) for free Ti³⁺, V²⁺ and Sc³⁺ ions respectively are :

(At.No. Sc : 21, Ti : 22, V : 23)

Which one of the following is correct structure for cytosine?

Identify the species having one $$\pi$$-bond and maximum number of canonical forms from the following :