What is 'X' in the following reaction?

What is 'A' in the following reaction?

What is 'A' in the following reaction ?

What 'X' in the following reaction ? KHSO_(4)+F_(2) to HF+X

What 'X' in the following reaction ? C_(6)H_(5) -C-=C-H overset(Hg^(+2))underset("dil" .H_(2)SO_(4))rarr X

What is X of the following reaction? Me_(2)C=CHCH_(3)+CHCl_(3) overset(Me_(3))X

What is the "X" in the following reaction 2CH_3 COCH_3 overset(Ba(OH)_2 ) too X

What is X in the following nuclear reaction? N_7^14 + H_1^1 to O_8^15 +X