Molecule has the R configuration? Which of the following substance does NOT func

Question

Molecule has the R configuration? Which of the following substance does NOT function as a Lewis acid? BF_3 N(CH_3)_3 (CH_3)_3C AlBrs What is the stereoisomeric products from the following reaction? One meso compound Two meso compounds Two diastereomers one racemate What factor is responsible for a greater heat of combustion per CH_2fdrcyclopropane that combustion per CH_2 for cyclohexane? Cyclohexane has a different hydrogen to carbon ratio than cyclopropane Cyclohexane is a strained ring relative to cyclopropane. Cyclopropane is a strained ring relative to cyclohexane. Cyclohexane has more carbon than cyclopropane.

Explanation / Answer

2)

Rules to find R and S configuration

(i) find the chirality center of the compound

(ii) Assign priority (1 to 4)to each group attached to the chiral center based on atomic number of atom in that group attached to chiral center, (usually if hydrogen is attached to chiral atom it will take lower priority 4)

(iii) if atomic number are same then go along the chain of the group to find the difference between the groups and assign priority

(iv) after assigning priority keep the lowest priority group out and number the remaing group from priority 1 draw a circle towards the 2 and 3 if it is in clockwise direction it is R configuration

if it is in anticlockwise direction it is S configuration

Here (b) has R configuration Answer

(3) Lewis acid is one accepts lone pair of electrons

all others except :N(CH3)3 accepts lone pair of electrons but only this will not accept as it is already in stable octet structure

Answer is (b) :N(CH3)3

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