Which of the following alkyne on treatment with $H_{2} (2 m o l e) / P t$ gives an optically inactive compound ?

3 - M e t h y l - 1 - p e n t y n e

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3 - M e t h y l - 1 - h e x y n e

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3 - M e t h y l - 1 - h e p t y n e

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None of the above

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Solution

The correct option is A $3 - M e t h y l - 1 - p e n t y n e$
On treating two mole of $H_{2} / P t$ , an alkyne gets converted into alkane.

Refer to image

Due to presence of two Me groups, this is not a chiral compound. So it is optically inactive.

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Which of the following alkyne on treatment with H2(2 mole)/Pt gives an optically inactive compound ?

The correct option is A 3−Methyl−1−pentyneOn treating two mole of H2/Pt, an alkyne gets converted into alkane. Refer to image Due to presence of two Me groups, this is not a chiral compound. So it is optically inactive.

Which of the following alkyne on treatment with $H_{2} (2 m o l e) / P t$ gives an optically inactive compound ?

The correct option is A $3 - M e t h y l - 1 - p e n t y n e$
On treating two mole of $H_{2} / P t$ , an alkyne gets converted into alkane.

Refer to image

Due to presence of two Me groups, this is not a chiral compound. So it is optically inactive.