【Ethylene Question Bank】10.20 True or False: The dehydrogenation ability of alkanes is related to the molecular structure of the alkanes
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The dehydrogenation ability of alkanes is related to their molecular structure; generally, the order of ease in dehydrogenation is: tertiary hydrogens > secondary hydrogens > primary hydrogens. Correct, correct +5 explanation +10
The dehydrogenation ability of alkanes is related to their molecular structure; generally, the order of ease in dehydrogenation is: tertiary hydrogens > secondary hydrogens > primary hydrogens. Error
The dehydrogenation ability of alkanes is related to their molecular structure; generally, the order of ease in dehydrogenation is: tertiary hydrogens > secondary hydrogens > primary hydrogens. (Yes)
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The dehydrogenation ability of alkanes is related to their molecular structure; generally, the order of ease in dehydrogenation is: tertiary hydrogens > secondary hydrogens > primary hydrogens. (Correct)
Correct. It is easier for the same alkane to undergo chain scission than dehydration; the longer the carbon chain, the easier it is to break apart. Chain scission is an irreversible process, while dehydration is reversible. Scission at both ends of the molecule has advantages. Ethane does not undergo chain scission but only dehydration to produce ethylene; methane remains unchanged at normal cracking temperatures. The main products are hydrogen, methane, ethylene, and propylene. Feature: An ideal raw material for producing ethylene and propylene. Rules for the cracking of isomeric alkanes: They crack or dehydrate more easily than n-alkanes. The ability to undergo dehydration depends on the molecular structure, with the order of ease being tertiary hydrogens > secondary hydrogens > primary hydrogens. As the number of carbon atoms increases, the difference in the yields of ethylene and propylene obtained from the cracking of isomeric alkanes and n-alkanes decreases. The main products are hydrogen, methane, ethylene, propylene, and C4 olefins. Feature: The yields of ethylene and propylene obtained from the cracking of isomeric alkanes are much lower than those obtained from the cracking of n-alkanes, whereas the yields of hydrogen, methane, C4 olefins, and olefins with more than 4 carbon atoms are higher
The dehydrogenation ability of alkanes is related to their molecular structure; generally, the order of ease in dehydrogenation is: tertiary hydrogens > secondary hydrogens > primary hydrogens (correct)
The dehydrogenation ability of alkanes is related to their molecular structure; generally, the order of ease in dehydrogenation is: tertiary hydrogens > secondary hydrogens > primary hydrogens. √
The dehydrogenation ability of alkanes is related to their molecular structure; generally, the order of ease in dehydrogenation is: tertiary hydrogens > secondary hydrogens > primary hydrogens. (Yes)