a.How many conformational isomers are possible of 4-isopropyl cylohexan-1,2-diols (I) ? b.Which isomers of (I) cannot form intramolecular H-bonding ? c.Which conformational isomer of cis-cyclohexan-1,3-diol forms intramolecular H-bonding ? d.Which conformational isomer of cis-cyclohexan-1,4-diol forms intramonal H-bonding ?

a.How many conformational isomers are possible of 4-isopropyl cylohexa

1.	a.How many conformational isomers are possible of 4-isopropyl cylohexan-1,2-diols (I) ? b.Which isomers of (I) cannot form intramolecular H-bonding ? c.Which conformational isomer of cis-cyclohexan-1,3-diol forms intramolecular H-bonding ? d.Which conformational isomer of cis-cyclohexan-1,4-diol forms intramonal H-bonding ?
Answer» Solution :a.For conformational isomers are possible. BULKY isopropyl group in equatiorial (e) form is more STABLE b.Isomer (A) cannot form H-bonding since two (OH) groups are position and POINT away form each other. Stability order is `B gt C = D gt A` . (Diequatorial form is more stable). c. Although (I) is diaxial, it is more than diequatorial (II) due to H-bonding in (I). d.Diaxial boat form of cis-cyclohexan-1,4-diol forms H-bonding due to very CLOSE (1fp - 4fp) distance (183 pm) and thus is more stable. Although (I) daixial, it is more stable than diequatorial (II) due to H-bonding in (I).