L 60. Pertaining to halogeno-alkanes, which of the following propositions is correct? A. They show a reactivity of the order: RClgt RBrgt RI B. They obey the general formula C_(n)H_(2n+1)X C. The can be prepared from a HX and alcohol D. They produce a nitrile upon reflux with KCN in alcohol E. None of the above 61. The carbonyl bond in aldehydes and ketones consist of: A. Two sigma bonds B. One sigma and one pi bond C. Two pi bonds D. Sigma bonds E. None of the above 62. Which of the following substances would liberate nitrogen gas when treated with nitric acid? A NH2CH2COOH B. CH3CONH2 C. CH3CH2NH2 D. CH3COCl E. None of the above

60. The correct answer is A. Halogeno-alkanes, also known as alkyl halides, show a reactivity order of . This is because the reactivity increases as the halogen atom becomes more electronegative, with chlorine being the most electronegative and iodine being the least.61. The correct answer is B. The carbonyl bond in aldehydes and ketones consists of one sigma bond and one pi bond. The sigma bond is formed by the overlap of two sp2 hybrid orbitals, while the pi bond is formed by the overlap of two p orbitals.62. The correct answer is A. would liberate nitrogen gas when treated with nitric acid. This is because the amide group (-CONH2) can be nitrated to produce a nitro group (-NO2), which can then be reduced to produce an amine (-NH2). The amine can then react with nitric acid to produce nitrogen gas.