Question

A+H2→CH3-CH2CH3,Identify the 'A'.

Answer 1

$\bold{Given,}$

$\bold{A+H_2\longrightarrow CH_3-CH_2-CH_3}$

$\displaystyle\sf{We\: know\: that\: adding\: a\: hydrogen\: molecule\: to\: a\: double\: bonded\: atom\: gives\: a\: single\: bonded\: compound}$

So this hydrogen atom is added to a double bonded atom.

It should be ethene.

$\boxed{\displaystyle\sf{A\longrightarrow CH_2=CH_2}}$