Question

please solve properly and answer on paper..​

Answer 1

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Answer is ( 4 ) .

Because it contains two electron withdrawing groups around $\mathtt{CH_{2}}$ and this $\mathtt{CH_{2}}$ group is called active methylene group and its hydrogens are acidic .

The reason is the same I accidently put there 3 sorry for that ..

Answer 2

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is ( 4 ) .

Because it contains two electron withdrawing groups around $\sf \pmb{CH_{2}}$2and this $\sf \pmb{CH_{2}}$group is called active methylene group and its hydrogens are acidic .