State the reactions of nucleophile

1. SN1 reactioin

2. SN2 reaction

(these will be explained below)

Explanation:

SN1 reaction (with example)

The hydrolysis of tert-butyl bromide with aqueous NaOH solution is an example of an SN1 reaction. The rate of the reaction depends on the concentration of tert butyl bromide but it is independent of the concentration of NaOH. Hence, the rate-determining step only involves tert-butyl bromide.

SN2 reaction (also with example)

The SN2 reaction is a good example of stereospecific reaction, one in which different stereoisomers react to give different stereoisomers of the product. Also, SN2 reaction is the most common example of Walden inversion where an asymmetric carbon atom undergoes inversion of configuration.

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step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

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(i popped my answer into google translate so it may be a bit wonky)