Question

8. A perspective drawing of 1-chloro-2-isopropyl-4-methylcyclohexane is shown below. Place the alkyl groups on structure A, then perform a ring flip and draw the resulting conformer. (8 points) CI RH Vichael & cu +2 147

Answer 1

Q.8. - chloro. 2- isopropyl-4-methylcyclohexane chair form structure of ring bripping as follows: 2- 4 cl net Ring Fipping More stable - less stable The chair conformation in which bulky group present at equatorial position is more stable. Isomer A is more stable because the bulky substituents like isopropyl & methyl groups are present at equatorial position In case of isomer methyl of isopropyl groups are present at axial position interact with hydrogen at axlal positim, such interaction is I called butane gauch interaction Due to butane gauch interaction energy of somer increases, Therefore isomer B is less stable than somer A.

OH • Here, there are two (2) stereo centers are I present. j.e. there are two chiral carbons. Chiral carbon is the carbon having your different groups attached. carbon number 2 is nor chiral because it contains -ch, H & 2 chp group. On Total number of stereoisomers = 2n where n= Total number of carbons (chiral) - Here na 2 le. 2 chiral carbons. T. Stereoisomers = 2 Total stereoisomess - 41 So above compound contains 4 stereoisomers.