Give the structure of the product you would expect from the reaction (if any) of 2-butyne with one molar equivalent of hbr. if there is no product, simply draw the reactant, 2-butyne. note: all structures should be drawn with no bonds between carbon and hydrogen.

(Z)-2-bromo-2-butene is produced here.

Explanation:

Reaction of 2-butyne with one equivalent of HBr yields (Z)-2-bromo-2-butene.

In the first step, protonation of triple bond produces a carbocation with a double bond. Two methyl groups present in carbocation remain in opposite side to avoid steric interaction.

In the second step, a bromide ion gives nucleophilic addition reaction with carbocation to give (Z)-2-bromo-2-butene.

Full reaction mechanism has been shown below.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.