On mixing a certain alkane with chlorine and irradiating it with ultravioletlight, it forms only one monochloroalkane. This alkane could be

Butene-1 may be converted to butane by reaction with

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄ the initiation step is

When CH₂ = CH - COOH is reduced with LiAlH₄, the compound obtained will be