If the de Broglie wavelength of the electron in n^th Bohr orbit in a hydrogenic atom is equal to 1.5 $$\pi $$a₀ (a₀ is Bohr radius), then the value of n/z is -

The major product in the following conversion is –

The major product of the following reaction is –

The aldehydes which will not form Grignard product with one equivalent Grignard reagents are -