Predict the products of the following reactions.
(i) $C{H}_3-C=O\stackrel{H_{2}N-N{H}_2}{\to }$
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$C{H}_3$
(ii)$C_6{H}_5-C{H}_3\underset{\left(b\right)H^{+}}{\overset{\left(a\right)KMn{O}_4/KOH}{\to }}$
(iii) $Ph-COOH\stackrel{B{r}_2/FeB{r}_3}{\to }$

31>how decide stability of following carbocation :

i>C6H5--CH2+ ii>p-(NO2)C6H5--CH2+ iii> p-(NH2)C6H5--CH2+ iv> p-(CH3)C6H5--CH2+

29> correct order of rate of reaction with HBr for following alkene :

i>(CH3)2--C==C--(CH3)2 ii>(CH3)2--C==CH--(CH3)

iii>(CH3)2--C==CH2 iv>CH3--CH==CH--CH3