Question

12 multiple choice 2 points which of the following reactive intermediate species maintains sp3 hybridization? methyl carbanion tertiary carbocation secondary alkyl radical dibromocarbene

Explanation:

Step1: Analyze methyl carbanion

A methyl carbanion has a carbon atom with three $\sigma$-bonds and one lone - pair of electrons. The carbon is $sp^{3}$ hybridized as it has four electron - groups around it (three bonding and one non - bonding), giving a tetrahedral geometry.

Step2: Analyze tertiary carbocation

A tertiary carbocation has a carbon atom with three $\sigma$-bonds and no lone - pair of electrons. The carbon is $sp^{2}$ hybridized as it has three electron - groups around it, giving a trigonal planar geometry.

Step3: Analyze secondary alkyl radical

A secondary alkyl radical has a carbon atom with three $\sigma$-bonds and one unpaired electron. The carbon is $sp^{2}$ hybridized as it has three electron - groups around it, giving a trigonal planar geometry.

Step4: Analyze dibromocarbene

Dibromocarbene has a carbon atom with two $\sigma$-bonds and one lone - pair of electrons. The carbon is $sp^{2}$ hybridized as it has three electron - groups around it, giving a trigonal planar geometry.

Answer:

A. methyl carbanion