Which of the following molecules are chiral?

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(D) molecule is chiral if it lacks a plane of symmetry,a center of symmetry,or an alternating axis of symmetry.$(I)$ $2,3$-butanediol (anti form) has

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$II, III, IV$

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(D) molecule is chiral if it lacks a plane of symmetry,a center of symmetry,or an alternating axis of symmetry.$(I)$ $2,3$-butanediol (anti form) has a center of symmetry,making it achiral (meso).$(II)$ $2,3$-butanediol (gauche form) lacks any symmetry elements,making it chiral.$(III)$ The Newman projection shows a conformation that lacks a plane of symmetry,making it chiral.$(IV)$ $1$-methylbicyclo[$1.1.0$]butane is chiral as it lacks any internal symmetry elements.$(V)$ Spiro compounds like this one are chiral due to the restricted rotation and lack of symmetry.Therefore,molecules $II, III, IV,$ and $V$ are chiral. Given the options,$(D)$ is the most appropriate choice based on the provided set.

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