According to Bohr theory which one of the following values of angular momentum of hydrogen atom is not permitted ?

Options

A. `(1.25h)/(pi)`
B. `(h)/(pi)`
C. `(1.5h)/(pi)`
D. `(0,5h)/(pi)`

Answer

a

Explanation

Angular momentum of an electron (mvr)`=(nh)/(2pi)`where n `=1,2,3,4…`
(a)`(1.125h)/(pi)=(nh)/(2pi)implies n=2.5``(1.125h)/(pi)=(nh)/(2pi)implies n=2.5`
(b)`h/pi=(nh)/(2pi)impliesn=2`
(c)`(1.5h)/(pi)=(nh)/(2pi)implies n=2`
`(0.5h)/(pi)=(nh)/(2pi)implies n=3`