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Z has lower molecular mass than P (aliphatic compound) and does not give iodoform test.
Mass of R (in grams) is……………
All reactions are assumed to proceeded with $100 %$ yield.
$C = 12 u, B r = 80 u, O = 16 u, H = 1 u$

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answer is 7.45.

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Detailed Solution

Molecular mass of given compound $= 142$
Moles of reactant $= 0.05 m o l e s$
Molecular mass of $R = 149$
Mass of $R = 0.05 \times 149 = 7.45$ grams

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