When does LiAlH4 reduce double bond?When it is in conjugation with either phenyl or carbonyl or both?

 LiAlH4 reduces double bond in case of only when it is conjugation with phenyl ring but ''cinnamic acid'' is an excepection because it has both carbonyl carbon as well as phenyl ring in its conjugation.

 LiAlH4 reduces double bond when it is in conjugation with phenyl but not in case of carbonyls. there is an exception to it that is ''cinnamic acid'' but it has both the phenyl ring on one side and carbonyl on the other side.the figure is given below.