Mark the correct increasing order of reactivity of the following compounds with HBr / HCl.
1. I < II < III
2. II <I < III
3. II < III < I
4. III < II < I
Which of the following reagents can be used to oxidize primary alcohols to aldehydes?
I. in anhydrous medium
II. in acidic medium
III. Pyridinium chlorochromate
IV. Heat in the presence of Cu at 573K
Choose the correct option
1. (I, II, III)
2. (II, III, IV)
3. (I, III, IV)
4. (I, II, IV)