ALLYLIC CARBON – BENZYLLIC CARBON – VINYLLIC CARBON.<\/p>\n
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Let’s break down the difference between Allylic<\/strong>, Benzylic<\/strong>, and Vinylic<\/strong> carbons \u2014 important concepts in organic chemistry<\/strong>, especially in understanding reactivity and stability<\/strong> of molecules.<\/p>\n An allylic carbon<\/strong> is a carbon atom that is adjacent to a carbon-carbon double bond (C=C)<\/strong>.<\/p>\n C=C\u2013C(Allylic\u00a0carbon\u00a0is\u00a0the\u00a0single-bonded\u00a0carbon\u00a0next\u00a0to\u00a0the\u00a0double\u00a0bond)\\text{C=C\u2013C} \\quad \\text{(Allylic carbon is the single-bonded carbon next to the double bond)}<\/span>C=C\u2013C<\/span><\/span>(Allylic\u00a0carbon\u00a0is\u00a0the\u00a0single-bonded\u00a0carbon\u00a0next\u00a0to\u00a0the\u00a0double\u00a0bond)<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n In propene (CH\u2082=CH\u2013CH\u2083)<\/strong>, the CH\u2083 carbon is allylic<\/strong>.<\/p>\n<\/li>\n<\/ul>\n Allylic positions are more reactive<\/strong> due to the possibility of resonance stabilization<\/strong> of intermediates (like allylic carbocations or radicals).<\/p>\n<\/li>\n<\/ul>\n A benzylic carbon<\/strong> is a carbon atom that is directly attached to a benzene ring<\/strong>, and is not part of the ring itself<\/strong>.<\/p>\n C6H5\u2013CH2\u2013R(The\u00a0CH\u2082\u00a0is\u00a0benzylic)\\text{C}_6\\text{H}_5\u2013CH_2\u2013R \\quad \\text{(The CH\u2082 is benzylic)}<\/span>C<\/span>6<\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span>H<\/span>5<\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span>\u2013<\/span>C<\/span>H<\/span>2<\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span>\u2013<\/span>R<\/span>(The\u00a0CH\u2082\u00a0is\u00a0benzylic)<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n In toluene (C\u2086H\u2085\u2013CH\u2083)<\/strong>, the CH\u2083 group<\/strong> contains a benzylic carbon<\/strong>.<\/p>\n<\/li>\n<\/ul>\n Highly reactive<\/strong> due to resonance stabilization from the aromatic ring.<\/p>\n<\/li>\n Benzylic carbocations, radicals, and anions are all resonance stabilized<\/strong>.<\/p>\n<\/li>\n<\/ul>\n A vinylic carbon<\/strong> is a carbon atom that is directly involved in a double bond (C=C)<\/strong>.<\/p>\n C=C(Both\u00a0carbons\u00a0are\u00a0vinylic)\\text{C=C} \\quad \\text{(Both carbons are vinylic)}<\/span>C=C<\/span><\/span>(Both\u00a0carbons\u00a0are\u00a0vinylic)<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n In ethene (CH\u2082=CH\u2082)<\/strong>, both CH\u2082 groups contain vinylic carbons<\/strong>.<\/p>\n<\/li>\n<\/ul>\n Less reactive<\/strong> toward many substitution reactions.<\/p>\n<\/li>\n Vinylic carbocations are not resonance stabilized<\/strong>, so they are less stable<\/strong>.<\/p>\n<\/li>\n<\/ul>\n
\n\ud83e\uddec 1. Allylic Carbon<\/strong><\/h2>\n
\ud83d\udd39 Definition:<\/strong><\/h3>\n
\ud83d\udd38 Structure:<\/strong><\/h3>\n
\ud83e\udde0 Example:<\/strong><\/h3>\n
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\u2705 Properties:<\/strong><\/h3>\n
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\n\ud83e\uddec 2. Benzylic Carbon<\/strong><\/h2>\n
\ud83d\udd39 Definition:<\/strong><\/h3>\n
\ud83d\udd38 Structure:<\/strong><\/h3>\n
\ud83e\udde0 Example:<\/strong><\/h3>\n
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\u2705 Properties:<\/strong><\/h3>\n
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\n\ud83e\uddec 3. Vinylic Carbon<\/strong><\/h2>\n
\ud83d\udd39 Definition:<\/strong><\/h3>\n
\ud83d\udd38 Structure:<\/strong><\/h3>\n
\ud83e\udde0 Example:<\/strong><\/h3>\n
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\u26a0\ufe0f Properties:<\/strong><\/h3>\n
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\n\ud83d\udd0d Comparison Table:<\/strong><\/h2>\n