హెక్సామెథిలీన్ డైమైన్ ఫార్ములా ________.

1
NH 2 (CH 2 ) 4 NH 2
2
NH 2 (CH 2 ) 6 NH 2
3
NH 2 (CH 2 ) 3 NH 2
4
NH 2 (CH 2 ) 2 NH 2

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