Which of the following is not known

Options :
  1. NCl5
  2. NI3
  3. SbCl3
  4. NCl3
Answer and Explanation :-

Answer: Option 1

Explanation:

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But we never get back our youth. The pulse of joy that beats in us at twenty becomes sluggish. Our limbs fail, our senses rot. We degenerate into hideous puppets, haunted by the memory of the passions of which we were too much afraid, and the exquisite temptations that we had not the courage to yield to.
-Oscar Wilde The Picture of Dorian Gray