can someone please tell me if I got number 15 correct? If not please explain...

Question

can someone please tell me if I got number 15 correct? If not please explain... im lost

15)The specific rotation of optically pure (R)-sec-butyl alcohol is -13,52. An optically pure sample of (R)sec butyl bromide was converted into the corresponding sec-butyl alcohol via an SN2 reaction. What is the specific rotation of the product, assuming 100% yield? A)-13.52 B) between 0° and-13.52 C) between 0° and +13.52 D) +13.52 s)+13.S2 zero 16) What product results from the SN2 reaction between (R)-2-chloropentane and hydroxide? A) (R)-2-pentanol (S)-2-pentanol over ted racemic pentanol D) 1-pentanol E) 3-pentanol 17) Draw the product for the following SN2 reaction.

Explanation / Answer

15. The specific rotation of R and S isomers are always equal in magnitude but differs in the direction of rotation. That is if R is +1 the rotation corresponding to S is -1

R- secondary butyl bromide on reacting is converted to sec-butyl alcohol.

During SN2 reaction, inversion of configuration takes place. That is if you have taken R isomer, you will get S isomer after the reaction.

Thus the product is S- secondary butyl alcohol

Given that specific rotation of R- secondary butyl alcohol is -13.52 o .

Then the specific rotation of the, S- secondary butyl alcohol, the product is +13.52 o . Option D is the correct answer.

16. Option B, as mentioned. Inversion will take place during SN2 reaction

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