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1.7 Drawing Organic Structures Problem 1.19 Determine the geometry around all se

ID: 1083804 • Letter: 1

Question

1.7 Drawing Organic Structures Problem 1.19 Determine the geometry around all second-row elements in each compound. Problem 1.20 Predict the indicated bond angles in each compound. b. CH-CCl Problem 1.21 Using the principles of VSEPR theory, you can predict the geometry around any atom in any molecule, no matter how complex. Enanthotoxin is a poisonous compound isolated from a common variety of hemlock grown in England. Predict the geometry around the indicated in enanthotoxin. -c-C-C-C-c HO-C-C C-C H..C-Czc-coYfH H H HHH

Explanation / Answer

19.

(a) CH3-CO-CH3

According to VSEPR theory, number of electron pairs around central atoms = number of hybrid orbitals.

While counting electron pairs include lone pairs and treat multiple bonds as eingle electron pair.

therefor,

In the given compound acetone,

From left to right,

C1 = sp3 (tetrahedral - all are bond pairs)

C2 = sp2 (trigonal planar because of 3 bond pairs)

O = sp2 ( Linear because among 3 e.p , 2 are lone pairs and only 1 is bond pair)

C3 = sp3 - Tetrahedral ( All e.p are bondpairs)

(b)

CH3 - O - CH3

From left to rigth,

C1 = sp3 - tetrahedral

O = sp3 - angular

C2 = sp3 - tetrahedral

(c)

NH2-

N = sp3 - angular

(d)

CH3-CN

from left to rigth

C1 = sp3 - tetrahedral

C2 = sp - linear

N = sp - linear

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