enter image description here

According to me they are not enantiomers because the mirror image can be rotated by $180^\circ$ to get the same compound. Giving it a little more 3-D look:

my attempt

But the book says they are enantiomers. I don’t understand how?

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    $\begingroup$ The book is wrong. $\endgroup$ – jerepierre Jan 7 '16 at 15:21
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    $\begingroup$ Related: Does trans 1,3-dichlorocyclobutane have zero dipole moment? $\endgroup$ – user7951 Jan 7 '16 at 15:22
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    $\begingroup$ They are certainly mirror images, but since they are superimposable on each other, they are not enantiomers. goldbook.iupac.org/E02069.html $\endgroup$ – orthocresol Jan 7 '16 at 15:29
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    $\begingroup$ Like stated in the question Loong linked, there is also a mirror plane present. $\endgroup$ – Martin - マーチン Jan 7 '16 at 15:35
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    $\begingroup$ The molecules are identical (i.e. the same substance) not enatiomers. $\endgroup$ – A.K. Jan 7 '16 at 15:36

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