How many benzylic hydrogens are present in th | vedclass

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(B) The structure shown is acenaphthene. Benzylic hydrogens are those attached to a carbon atom that is directly bonded to an aromatic ring. In acenap

Vedclass · Accepted Answer

$4$

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(B) The structure shown is acenaphthene. Benzylic hydrogens are those attached to a carbon atom that is directly bonded to an aromatic ring. In acenaphthene,the two carbons of the ethylene bridge are bonded to the naphthalene ring system. Each of these two carbons is bonded to two hydrogen atoms,and there is one additional hydrogen on the bridgehead carbons if we consider the specific structure of acenaphthene. However,in the standard representation of this molecule,there are $4$ hydrogens on the $CH_2-CH_2$ bridge and $1$ hydrogen on each of the two bridgehead carbons,but only the $4$ hydrogens on the $CH_2$ groups are typically classified as benzylic. Wait,re-evaluating the structure: The structure is acenaphthene. The $CH_2-CH_2$ bridge has $4$ hydrogens. The bridgehead carbons are part of the aromatic system and do not have hydrogens. Thus,there are $4$ benzylic hydrogens.

How many benzylic hydrogens are present in the hydrocarbon shown below?

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