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In all compounds of IUPAC name \( \mathrm{P}_{1} \)-bromo- \( \mathrm{P}_{2} \) -
P chloro- \( \mathrm{P}_{3} \)-methyl but \( \mathrm{P}_{4} \)-yne, which is always

W correct \( (\mathrm{P} \) represent position of side chain and multiple bond according to IUPAC).
(1) \( \frac{\mathrm{P}_{1}}{\mathrm{P}_{4}}=\frac{1}{4} \)
(2) \( \frac{\mathrm{P}_{1}}{\mathrm{P}_{4}}=\frac{1}{2} \)
(3) \( \frac{\mathrm{P}_{1}}{\mathrm{P}_{3}}=\frac{1}{3} \)
(4) \( \frac{\mathrm{P}_{4}}{\mathrm{P}_{3}}=\frac{1}{3} \)
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