P W \( [\mathrm{X}] \) and \( [\mathrm{Y}] \) respectively are (1) ...
P
W
\( [\mathrm{X}] \) and \( [\mathrm{Y}] \) respectively are
(1) \( \mathrm{BrCH}_{2} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2} \) and \( \mathrm{C}_{2} \mathrm{H}_{5}-\mathrm{CHBr}-\mathrm{CH}_{3} \)
(2) \( \mathrm{C}_{2} \mathrm{H}_{5}-\mathrm{CH}_{2} \mathrm{CH}_{2}-\mathrm{Br} \) and
\[
\mathrm{Br}-\mathrm{CH}_{2} \mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}_{2}
\]
(3) \( \mathrm{C}_{2} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CH}_{2} \mathrm{Br} \) and \( \mathrm{C}_{2} \mathrm{H}_{5}-\mathrm{CHBr}-\mathrm{CH}_{3} \)
(4) \( \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{CHBr}-\mathrm{CH}_{3} \) and \( \mathrm{C}_{2} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CH}_{2} \mathrm{Br} \)
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