The claisen condensation converts 2 molecules of an ester into a β-keto ester. the reaction starts with the ester in an alkoxide/alcohol solution and is worked up with acid to form the neutral β-keto ester product. show the curved-arrow mechanism for the claisen condensation of ethyl ethanoate treated with ethoxide ion.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

10 years is the answer

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer