Below are drawn cis & tram decalin, C_10 H_18, saturated bicycled hydrocarbons A

Question

Below are drawn cis & tram decalin, C_10 H_18, saturated bicycled hydrocarbons As shown, there are two stereoisomers of decalin. Both consist of a pair of cyclohexane chairs fused together. The two bridgehead hydrogens in the trans & isomer are both axial and are designated with arrows. trans-Decalin has a rigid structure with no gauche interactions. How many gauches does the cis have. Use molecular models to answer this question. Is ft aws-decalin chiral or achiral cis-Decalin is not rigid and can undergo chair-chair flips. Is that molecule chiral or achiral Consider the 2 stereoisomers of 1.6-dimethyldecalin drawn below. How many gauche interactions does each isomer have?

Explanation / Answer

cis decalin has 4 gauche interactions where as trans decaline is zero

A trans decaline is achiral

B cis decaline is achiral

C.trans isomer 8 gauch interactions,

cis isomer has 6 gauche interactions

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