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एक ऐल्किल हैलाइड `C_(5)H_(11)Br` ऐल्कोहॉलिक KOHसे क्रिया करने पर पेन्ट-1-ईन देता है । ऐल्किल हैलाइड की संरचना दीजिए ।

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अणुसूत्र `C_(5)H_(11)Br` के संभावित स्थान समावयवी (position isomers) निम्नलिखित हैं -
`CH_(3)-CH_(2)-underset("1-ब्रोमोपेन्टेन")(CH_(2))-CH_(2)-CH_(2)-Br" "CH_(3)-CH_(2)-underset("ब्रोमोपेन्टेन")(CH_(2))-overset(Br)overset(|)(CH)-CH_(3)`
`CH_(3)-CH_(2)-underset("3-ब्रोमोपेन्टेन")overset(Br)overset(|)(CH)-CH_(2)-CH_(3)`
ये समावयवी एल्कोहॉलिक KOH से निम्न प्रकार क्रिया करते हैं -
`CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(2)-Br underset("-HBr")overset("KOH(alc.)")(rarr)CH_(3)-underset("(केवल एक उत्पाद)")underset("पेन्ट-1-ईन")(CH_(2))-CH = CH_(2)`
`CH_(3)-CH_(2)-CH_(2)-overset(Br)overset(|)(CH)-CH_(3) underset("-HBr")overset("KOH(alc.)")(rarr)CH_(3)-CH_(2)-underset("प्रमुख उत्पाद)")underset("(सैट्जैफ़ नियमानुसार ")underset("पेन्ट-2-ईन")(CH)=CH-CH_(3)`
`CH_(3)-CH_(2)-overset(Br)overset(|)(CH)-CH_(2)-CH_(3)underset("-HBr")overset("KOH(alc.)")(rarr)CH_(3)-CH=underset("(केवल एक उत्पाद)")underset("पेन्ट-2-ईन")(CH)-CH_(2)-CH_(3)`
चूँकि दिया गया ऐल्किल हैलाइड केवल पेन्ट-1-ईन देता है । अत: यह 1-ब्रोमोपेन्टेन है तथा इसकी संरचना निम्नलिखित है -
`CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(2)Br`

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