The infrared spectrum of the starting material (2-methylcyclohexanone) will have a peak present at , which will be absent in the product (2-methylcyclohexanol).

1710 cm^-1

Explanation:

The Infrared spectrum of the starting material  will have a peak present at 1710 cm^-1.  this is because

2-methylcyclohexanone has a ketone group (C=O) which will be  reduced to an alcohol group (O-H), in the product i.e. (2-methylcyclohexanol). therefore the peak for the stretching vibration of the ketone carbonyl (C=O) is present only in the starting material only .and  The peak for the stretching is at 1710 cm^-1

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i