How many elements of unsaturation do molecules with a molecular formula of C_8H_

Question

How many elements of unsaturation do molecules with a molecular formula of C_8H_4N_2 have? 2 4 6 8 10 A newly isolated natural product was found to have the molecular formula C_15H_28O_2. By hydrogenating a sample of the compound, it was determined to possess one p bond. How many rings are present in the compound? 0 1 2 3 4 For which the following alkenes will cis- and trans- isomers not exist? a) only b) only both a)and c) d) only both c) and d) Circle the alkene below which has the smallest heat of hydrogenation.

Explanation / Answer

1) Ans D = 8

degree of unsaturation for C8H4N2 = 1/2(2C +2 - H), since there are 2N atoms , the # H atoms become 4-2 = 2

= 1/2(2*8 + 2 -2) = 8

2) Ans B= 1

Degree of unsaturation for C15H28O2 = 1/2 (30 + 2 -28) = 2

given that it has 1 pi bond, therefore remaining 1 degree of unsaturation corresponding to 1 ring.

3) Ans A = a) only

4) Ans a) has the smallest heat of hydrogenation

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