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[P]overset(Br(2))(to)C(2)H(4)Br(2)unders...

`[P]overset(Br_(2))(to)C_(2)H_(4)Br_(2)underset(NH_(3))overset(NaNH_(2))(to)[Q]`
`[Q]underset(Hg^(2+),Delta)overset(20%H_(2)SOS_(4))(to)[R]overset(Zn-Hg//HCl)(to)[S]`
The species P,Q,R and S respectively are

A

ethene, ethyne, ethanal, ethane

B

ethane, ethyne, ethanal, ethene

C

ethene, ethyne, ethanal, ethanol

D

ethyne, ethane, ethene, ethanal

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