The noble gas that does not occur in the atmosphere is :

Which of the following is not a correct method of the preparation of benzylamine from cyanobenzene ?

The major product obtained in the given reaction is :

Let f(x) = log_e(sin x), (0 < x < $$\pi $$) and g(x) = sin^–1 (e^–x ), (x $$ \ge $$ 0). If $$\alpha $$ is a positive real number such that a = (fog)'($$\alpha $$) and b = (fog)($$\alpha $$), then :