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The effect of ring substitution on the molecular geometry of amides of the type 2/3/4-XC 6 H 4 NHCO- CHCl 2  (X = CH 3  or Cl) has been studied by determining the crystal structures of the compounds N-(2-methylphenyl)-2,2-dichloro-acetamide, 2-CH 3 C 6 H 4 NH-CO-CHCl 2  (); N-(3-methylphenyl)- 2,2-dichloro-acetamide, 3-CH 3 C 6 H 4 NH-CO-CHCl 2  ( 3MPDCA ) and N-(3-chlorophenyl)- 2,2-dichloro-acetamide, 3-ClC 6 H 4 NH-CO-CHCl 2  ( 3CPDCA ). The results are analyzed along with our earlier crystal structures of the amides N-(phenyl)-2,2-dichloro-acetamide, C 6 H 5 NH-COCHCl 2  ( PDCA ); N-chloro-N-(phenyl)-2,2-dichloro-acetamide, C 6 H 5 NCl-CO-CHCl2 ( NCPDCA ); N-(4-methylphenyl)-2,2-dichloro-acetamide, 4-CH 3 C 6 H 4 NH-CO-CHCl 2  ( 4MPDCA ); N-(2-chlorophenyl)- 2,2-dichloro-acetamide, 2-ClC 6 H 4 NH-CO-CHCl 2  ( 2CPDCA ); N-(4-chlorophenyl)-2,2-dichloro- acetamide, 4-ClC 6 H 4 NH-CO-CHCl 2  ( 4CPDCA ). The results have also been compared and correlated with the crystal structure data of trichloro-acetamide analogues of the type 2/3/4- XC 6 H 4 NH-CO-CCl 3  (X = CH 3  or Cl): N-(phenyl)-2,2,2-trichloro-acetamide, N-(2-methylphenyl)- 2,2,2-trichloro-acetamide, N-(3-methylphenyl)-2,2,2-trichloro-acetamide, N-(4-methylphenyl)- 2,2,2-trichloro-acetamide, N-(2-chlorophenyl)-2,2,2-trichloro-acetamide, N-(3-chlorophenyl)-2,2,2- trichloro-acetamide, N-(4-chlorophenyl)-2,2,2-trichloro-acetamide, N-chloro-N-(phenyl)-2,2,2-trichloro- acetamide and N-(phenyl)-acetamide. The crystal system, space group, formula units and lattice constants in Å of the new structures are:  2MPDCA : monoclinic, P2 1 /n, Z = 4, a = 4.7059(5), b = 11.600(1), c = 18.918(2), β = 94.702(9)° ;  3MPDCA : orthorhombic, P2 1 2 1 2 1 , Z = 4, a = 4.759(1), b = 10.543(3), c = 20.205(5);  3CPDCA : orthorhombic, Pnma, Z = 4, a = 9.935(1), b = 6.997(1), c = 14.140(2).  2MPDCA ,  3MPDCA  and  3CPDCA  show a molecule each in their asymmetric units, in agreement with the observed  35 Cl NQR spectra of the compounds

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Effect of Substitution on the Molecular Geometry of N-(2/3/4-Substituted-phenyl)-2,2-dichloro-acetamides, 2/3/4-XC 6 H 4 NH-CO-CHCl 2  (X = CH 3  or Cl)