The compound shown reacts with one mole of H2 over Pd/C to give a saturated product. Its degree of unsaturation is

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The compound shown reacts with one mole of $H X_{2}$ over Pd/C to give a saturated product. Its degree of unsaturation is

The compound shown is propene,

C X_{3} H X_{6}

, with one C=C and no ring, so the degree of unsaturation is 1, matching the uptake of one mole of

H X_{2}