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Alpha carbon is the carbon directly attached to main functional group Then according this aromatic aldehyde should have 1 alpha h But how is it possible no alpha h are present in aromatic aldehyde??

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    $\begingroup$ In Ar-CHO the alpha carbon is the carbon of the aromatic ring that is attached to CHO. It is bond to two other atoms (C or heteroatoms) by the equivalent of a single bond and a double bond. It has no hydrogeens attached to it. $\endgroup$
    – Waylander
    Feb 4 at 7:57
  • $\begingroup$ Similarly, if –C(CH3)3 is attached to –CHO group, there is no alpha hydrogen either. $\endgroup$
    – Poutnik
    Feb 4 at 9:49
  • $\begingroup$ Thank-you so much it is very clear now!! $\endgroup$ Feb 4 at 9:58
  • $\begingroup$ Does ethanol contain any alpha hydrogen? $\endgroup$ Feb 4 at 10:53
  • $\begingroup$ The methyl group of ethanol is alpha to the carbon that bears the alcohol $\endgroup$
    – Waylander
    Feb 4 at 16:19

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