How many of the following responses are true? 1. sn1 leads to a racemization of sterechemistry due to the planar carbocation intermediate 2. sn2 leads to a racemization of sterechemistry due to the planar carbocation intermediate 3. a tertiary alkyl halide will tend to react through an sn2 mechanism because there is little hindrance to backside attack and a tertiary carbocation is not very stable 4. 1-bromopentane will undergo substitution through an sn1 mechanism 5. if r-3-bromo-3-methylhexane is allowed to react with oh- the product will be a 50%/50% mixture of r-3-methyl-3-hexanol and s-3-methyl-3-hexanol