68.
									
										IR spectroscopy cannot be used for-
									
								
															
														
																									
										A:
											Determination of functional groups in an organic compound 
									
																										
										B:
											Determination of molecular conformation and stereochemistry
									
																										
										C:
											 Determination of molecular orientation
									
																										
										D:
											Determination of the mass of the compound precisely
									
																								 
							
																
									The answer is:
										D