Question

1). Answer the following questions. a. If a hydrocarbon has nine carbon atoms, three double bonds, and one ring, how many hydrogen atoms must it have? b. Calculate the number of elements of unsaturation implied by the molecular formula CoH12. c. Give five examples of structures with this formula (CsH12). At least one should contain a ring, and at least one should contain a double bond. d. determine the number of elements of unsaturation implied by the molecular formula CSHSNO2, and draw three examples.

Answer 1

a) qe atoms, 3d.b., Ingi I out Inge I 12 H-atoms (6) Cotia Degree of unsaturation - Cs- 6-12 + = 6 - 12 – 0 to + + + +1 -- 0+0 (C) Examples of Gotra : (2) H = CH C C - 1) H the - Cz Or 1- Hexene Cyclohexane

(3) HC CH = CH CHg - CH₂ - Criz (4) Ho C-CH₂-CH=CH-CH₂ - CH3 or Or M . 2-Hexene 3- Hexene 3-evene -CH₂ sony geometrie Methyl cyclopentane 2,3-dimethyl-2-butene d) Hy NO : Deguee of unseburetion = 5-5 -0+ < + (3) EN done 2-Furamide meeting 1-2-yeno armlete my deny yestone 2 - Funenude Methyl-2-by and acylate

a) draw a chain of 9c ( it can't be straight chain because as given one ring is present) then draw 3 double bonds at any positions eg we draw a benezne ring (one ring + 3 d.b.) then complete the covalency of all Carbons with the help of Hydrogens i.e all Carbons should have 4 bonds.