Please explain them.

and An absorption band at 2820 and 2720cm1 due to the aldehyde CH stretching vibration would be present for the heptane and absent for the methylcyclohexane. An absorption band at 1250cm1 due to a CH stretching vibration would be present for the heptane and absent for the methylcyclohexane. An absorption band at 720cm1 due to in-phase rocking of the five adjacent methylene groups would be present for heptane and absent for methylcyclohexane. None of the above. * Incorrect; Try Again; 9 attempts remaining An absorption band at 36503200cm1 due to an OH stretching vibration would be present for the secondary alcohol and absent for the primary alcohol. An absorption band at 1250cm1 due to a CO stretching vibration would be present for the ester and absent for the amide. None of the above. The secondary alcohol would have an absorption band at 13851365cm1 for the methyl group. The primary alcohol does not have a methyl group, so it would not have this absorption band. An absorption band at 1250cm1 due to a CO stretching vibration would be present for the ketone and absent for the ester. None of the above. An absorption band at 1250cm1 due to a CH stretching vibration would be present for the ester and absent for the ketone . The C=O absorption band will be at a larger wavenumber for the ester (1740cm1) than for the ketone (1720cm1). None of the above. The C=O absorption band will be at a larger wavenumber for the aldehyde (1740cm1) than for the ketone (1720cm1). An absorption band at 2820 and 2720cm1 due to the aldehyde CH stretching vibration would be present for the aldehyde and absent for the ketone. An absorption band at 1250cm1 due to a CH stretching vibration would be present for the aldehyde and absent for the ketone . CH3CH2CH=CH2 and CH3CH2CH=CCH3 Absorption bands at 730cm1 and 675cm1 due to an sp2CH bending vibration would be present for the terminal alkene and absent for the internal alkene. None of the above. Absorption bands at 990cm1 and 910cm1 due to an sp2CH bending vibration would be present for the terminal alkene and absent for the internal alkene. Absorption bands at 980cm1 and 960cm1 due to an sp2CH bending vibration would be present for the terminal alkene and absent for the internal alkene. and An absorption band at 2820 and 2720cm1 due to the aldehyde CH stretching vibration would be present for the heptane and absent for the methylcyclohexane. An absorption band at 1250cm1 due to a CH stretching vibration would be present for the heptane and absent for the methylcyclohexane. An absorption band at 720cm1 due to in-phase rocking of the five adjacent methylene groups would be present for heptane and absent for methylcyclohexane. None of the above. * Incorrect; Try Again; 9 attempts remaining An absorption band at 36503200cm1 due to an OH stretching vibration would be present for the secondary alcohol and absent for the primary alcohol. An absorption band at 1250cm1 due to a CO stretching vibration would be present for the ester and absent for the amide. None of the above. The secondary alcohol would have an absorption band at 13851365cm1 for the methyl group. The primary alcohol does not have a methyl group, so it would not have this absorption band. An absorption band at 1250cm1 due to a CO stretching vibration would be present for the ketone and absent for the ester. None of the above. An absorption band at 1250cm1 due to a CH stretching vibration would be present for the ester and absent for the ketone . The C=O absorption band will be at a larger wavenumber for the ester (1740cm1) than for the ketone (1720cm1). None of the above. The C=O absorption band will be at a larger wavenumber for the aldehyde (1740cm1) than for the ketone (1720cm1). An absorption band at 2820 and 2720cm1 due to the aldehyde CH stretching vibration would be present for the aldehyde and absent for the ketone. An absorption band at 1250cm1 due to a CH stretching vibration would be present for the aldehyde and absent for the ketone . CH3CH2CH=CH2 and CH3CH2CH=CCH3 Absorption bands at 730cm1 and 675cm1 due to an sp2CH bending vibration would be present for the terminal alkene and absent for the internal alkene. None of the above. Absorption bands at 990cm1 and 910cm1 due to an sp2CH bending vibration would be present for the terminal alkene and absent for the internal alkene. Absorption bands at 980cm1 and 960cm1 due to an sp2CH bending vibration would be present for the terminal alkene and absent for the internal alkene