Which of the following reagents / reactions will convert 'A' to 'B' ?

Hex-4-ene-2-ol on treatment with PCC gives 'A'. 'A' on reaction with sodium hypoiodite gives 'B', which on further heating with soda lime gives 'C'. The compound 'C' is :

The conversion of propan-1-ol to n-butylamine involves the sequential addition of reagents. The correct sequential order of reagents is

In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?