compounds are noncyclic). There are a total of fve isomers:(b)The Eand Zisomers of 2-butenal are stereoisomers.(c)None of the C4H6O aldehydes and ketones is chiral.(d)The a,b-unsaturated aldehydes are (E)- and ; and .There is one a,b-unsaturated ketone in the group:.(e)The Eand Zisomers of 2-butenal are formed by the aldol condensation of acetaldehyde.18.19The main Favor component of the hazelnut has the structure shown.18.20The characteristic reaction of an alcohol on being heated with KHSO4is acid-catalyzed dehydration.Secondary alcohols dehydrate faster than primary alcohols, and so a reasonable frst step isThe product of this dehydration is an enol, which tautomerizes to an aldehyde. The aldehyde then
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