Comprehension
`E_2` raction `rarr` Elimination bimolecular
In the general mechanism of the `E_2` reaction a strong base abstract a proton on a carbon atom adjacent to the one of the leaving group. As the abstracts a proton , a double bond forms and the leaving group leaves.
In given pairs, which compound is more reactive toward `E_2` reaction

`(Q) CH_3 - underset((III))underset(Br) underset(|)CH-CH_3 " "CH_3 - underset((IV))underset(Br)underset(|)CH - CD_3`

(S) `underset(Ph- CH_3 -CH_2 Br " " Ph-underset(BrVIII)underset(|)CH-CH_3`

Options

A. P-II,Q-III,R-VI,S-VII
B. P-II,Q-III,R-VI,S-VI
C. P-I,Q-III,R-VI,S-VII
D. P-I,Q-II,R-V,S-VIII

Explanation

(P) Anti-elimination
(Q) C-H weak bond than C-D
(R) Resonance stable alkene
(S) Acidic hydrogen