For the compound shown, select all correct statements.

AIts degree of unsaturation is 6.
BSelective reduction of the C=C and C=O outside the ring (two moles of $H X_{2}$ ) gives a product of degree of unsaturation 4.
CIts degree of unsaturation equals that of $C X_{9} H X_{10} O$ .
DIt contains five pi bonds in total (counting each ring C=C of the Kekule structure).

Answer: A, B, D

The compound shown is cinnamaldehyde,

C X_{9} H X_{8} O

, DBE

= (20 - 8) /2 = 6

(ring plus 5 pi bonds). Taking up 2 mol

H X_{2}

removes two pi bonds: DBE

= 4

C X_{9} H X_{10} O

has

(20 - 10) /2 = 5

, so the third statement is false. Pi bonds: 3 ring C=C, 1 C=C, 1 C=O

= 5