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:
But the book says they are enantiomers. I don’t understand how?
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12The book is wrong. – jerepierre Jan 07 '16 at 15:21
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2Related: Does trans 1,3-dichlorocyclobutane have zero dipole moment? – Jan 07 '16 at 15:22
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5They are certainly mirror images, but since they are superimposable on each other, they are not enantiomers. http://goldbook.iupac.org/E02069.html – orthocresol Jan 07 '16 at 15:29
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1Like stated in the question Loong linked, there is also a mirror plane present. – Martin - マーチン Jan 07 '16 at 15:35
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1The molecules are identical (i.e. the same substance) not enatiomers. – A.K. Jan 07 '16 at 15:36
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@Loong – Jan Jan 07 '16 at 16:34
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“The books says” is somewhat better than “my book says” (to know that you didn't write it yourself), but it's still too incomplete bibliographical info. – mykhal Jan 16 '19 at 14:05