With organolithium and organomagnesium compounds, approach to the carbonyl carbon from the less hindered direction is generally preferred. assuming that this is the case, draw the structure of the major product formed when 4-tert-butylcyclohexanone reacts with phenylmagnesium bromide, followed by treatment with aqueous acid.

trans-4-tert-butyl-1-phenylcyclohexanol  

Explanation:

The bulky tert-butyl group will occupy the equatorial position in the cyclohexanone ring.

It will hinder approach of the Grignard reagent from the bottom side of the molecule.

The reagent will attack from the top, so the product alcohol will be

trans-4-tert-butyl-1-phenylcyclohexanol.

explanation:

detials on each model with digrams

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.