Anhydrous sodium acetate on heating with sodalime gives

What are $X$ and $Y$ respectively in the following reaction sequence?
Isopentane $\xrightarrow{KMnO_4} X$ $\xrightarrow{\text{dehydration}} \underset{\text{Major}}{Y}$

$Ph-CH=NO_2H$ $\xrightarrow[{3 \ days}]{{isomerises}}$ $\mathop {(x)}\limits_{(50-50\%)}$,Isomer $(x)$ is

Give the name,formula and structure of the cycloalkane which has only one structure.

Paraffins are soluble in

Which of the following reactions is used to prepare hydrocarbons with an even number of carbon atoms?
$i.$ Wurtz reaction
$ii.$ Decarboxylation reaction
$iii.$ Kolbe's electrolysis
$iv.$ Reduction
$v.$ Hydrogenation