Question: Why Bromine Is Less Reactive But More Selective?

Why is Cl more reactive than Br?

Although the bromine nucleus is more positively charged than the chlorine nucleus, the increase in the radius and the extra shielding in the bromine atom outweigh this factor, which means that an electron is more easily attracted into the outer shell of a chlorine atom than that of a bromine atom, so chlorine is more ….

Why does Group 7 get less reactive?

The reactivity of Group 7 elements decreases down the group. … The electrons in the outer shell move further away from the nucleus as we go down the group and the attraction force between the electrons and the nucleus become weaker and weaker. This weaker attraction in the larger atoms makes it harder to gain electron.

Is Cl or I more reactive?

Both Cl and I in Group 7. Both have 7 electrons in its outer shell and require 1 electron to obtain a full shell. … Cl can gain an electron more easily than iodine – Cl more reactive. This is because Cl is higher up Group 7 than iodine (Cl: 2,8,7 electron configuration).

What is the reaction called when bromine reacts with alkenes?

The bromine water turns colourless confirming the presence of an alkene. The bromine atoms break the carbon–carbon double bond and from C–Br bonds. This type of reaction is called an addition reaction and the addition of bromine to an alkene is called bromination. Test-tube containing bromine water.

What happens when Ethyne reacts with bromine?

give chemical reaction involved. Bromine water is brown in colour, when it is treated with ethyne then brown colour of solution decolorise due to the consumption of bromine. This test is known as bromine water test and is generally carried out for the determination of unsaturation in an organic compound.

Why is bromine less reactive than fluorine?

Larger atoms = less reactive. … For example chlorine is less reactive than fluorine because the outer electrons in a chlorine atom are further from the nucleusthan the outer electrons in a fluorine atom. It is harder for a chlorine atom to gain an electron than it is for a fluorine atom.

Is fluorine more reactive than bromine?

Relative Reactivity The smallest Halogens are best at doing this: so Fluorine is more reactive than Chlorine, which is more reactive than Bromine, which is more reactive than Iodine, which would be more reactive than Astatine.

Why alkane does not react with bromine?

Alkanes are far less reactive than alkenes and will only react with bromine water in the presence of UV light. Under these conditions, alkanes undergo substitution reactions with halogens, and will slowly de-colourise bromine water.

Why do alkanes not react with potassium permanganate?

✓ Potassium permanganate does not react with alkanes because they are saturated (single bonds which are all taken). ✓When it is added to alkanes the purple color does not change. indicates a positive test for unsaturation.

Why do alkanes have a low reactivity?

Alkanes contain only carbon – carbon and carbon – hydrogen bonds. These are both strong bonds so these molecules will only react in the presence of strong source of energy, strong enough to break these bonds. … These two factors taken together mean that alkanes are generally of very low reactivity.

Why is iodine the least reactive halogen?

Iodine is the least reactive of the halogens as well as the most electropositive, meaning it tends to lose electrons and form positive ions during chemical reactions.

Is iodine less reactive than bromine?

Bromine is more reactive than iodine, but not as reactive as chlorine.