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Which of the following statements is correct?

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The addition of HCl to 3,3-dimethyl-1-butyne exclusively gives 2,2-dichloro-3,3-dimethylbutane.

The number of isomers (including structural and stereoisomers) of alkynes $C_{6} H_{10}$ is eight.

The treatment of 1,1-dibromopentane with KOH(s) at 200 °C produces 1-pentyne.

The treatment of 1,1-dibromopentane with ${NaNH}_{2}$ followed by acid gives 2-pentyne.

answer is B.

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Detailed Solution

(a) The product is a mixture of three isomers as explained in the following.

Besides this, the other products are obtained due to the methyl shift in vinylic cation.

(b) There are eight isomers including stereo isomers.

( c) The initially formed 1-pentyne is converted into 2-pentyne because the more highly R-substituted alkyne is more stable.

(d) The very strong base ${NaNH}_{2}$ removes the terminal proton from the dehydrohalogenation product and thus it cannot rearrange.

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