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Consider the following figure representing variation of heat of combustion of isomeric butenes.
image
Based on this, answer the following questions :
Which will give products showing no optical activity, when treated with HBr?
A. P
B. Q
C. R
D. All of these

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Correct Answer - D
image
Product of reaction of all the alkene with HBr are optically inactive. Q will give achiral product and P.R and S give racemic 2-bromobutane.

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