The moecule with non-zero dipole moment is -

• A

  $\mathrm{BCl}_{3}$
• B

  $\mathrm{BeCl}_{2}$
• C

  $\mathrm{CCl}_{4}$
• Correct answer
  D

  $\mathrm{NCl}_{3}$

Hence, the correct answer is option: 'D'.