How does propane react with bromine under radical conditions?

Answer 1

It is conceived to be a radical process......

Halogenation of alkanes is a radical process, that tends to be indiscriminate (i.e. dihalogenated products are possible in that radical mechanisms can be quite unselective):

#"H"_3"CCH"_2"CH"_3 +"Br"_2 stackrel(hnu)rarr "H"_3"CCHBrCH"_3 +"HBr"#

The mechanism of halogenation is in your text, and the starting point is the homolysis of the bromine molecule by UV light:

#Br_2 +hnurarr2dotBr#
The #dotBr# radical, a 7 electron species, is very reactive inasmuch as when it reacts it generates another radical species to continue the chain of reaction:
#R-CH_3+dotBr rarrR-dotCH_2 +HBr#
#R-dotCH_2 +Br_2 rarr RCH_2Br + dotBr#
And the #dotBr# radical can continue the chain of reaction.......The reaction can terminate by the coupling of 2 radicals:
#R-dotCH_2 +dotCH_2R rarr RH_2C-CH_2R#
The presence of such #C-C# coupled products is good evidence for the intermediacy of these radicals. Most of the time, however, radical halogenation of alkanes will lead to a mess (whereas radical halogenation of benzyl groups is a bit more discriminating in that the stabilization of a benzyl radical allows selective formation of #PhCH_2Br#).
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Answer 2

Propane reacts with bromine under radical conditions through a process known as radical bromination, where hydrogen atoms in propane are replaced by bromine atoms, forming alkyl bromides. The reaction involves initiation, propagation, and termination steps. The overall reaction is:

C3H8+Br2InitiationC3H7Br+HBr\text{C}_3\text{H}_8 + \text{Br}_2 \xrightarrow{\text{Initiation}} \text{C}_3\text{H}_7\text{Br} + \text{HBr}

C3H7Br+Br2PropagationC3H6Br2+HBr\text{C}_3\text{H}_7\text{Br} + \text{Br}_2 \xrightarrow{\text{Propagation}} \text{C}_3\text{H}_6\text{Br}_2 + \text{HBr}

This process continues, leading to the formation of various brominated propane derivatives.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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