To convert $1 -$ butyne to $1 - D -$ butanal, one would carry out the following steps :
(I) Sodium amide, then $D_{2} O$
(II) Disiamy Iborane, then hydrogen peroxide/sodium hydroxide
(III) The transformation can not be carried out with the indicated reagents.

I

, followed by

I I

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I I

, followed by

I

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I I I

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I I

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Solution

The correct option is C $I I I$
For conversion of 1-butyne to 1-D-butanal

$C H \equiv C - C H_{2} - C H_{3} ⟶ C H_{3} - C H_{2} - C H_{2} - C H O$

so addition reaction of water with -OH groups on same carbon occurs. Here, where water is lost. Since neither of options indicate this, the indicated reagents can not be used.

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