What major product is formed when heptyne is treated with br2 in ccl4?
select one:
a. e-1,2-dibromoheptene
b. 1,1-dibromoheptene
c. z-1,2-dibromoheptene
d. 2,2-dibromoheptene

Option A is the Answer.

Explanation:

Treatment of alkyne with Bromine in the presence of produces a trans product that is, a alkenyl bromide.

E-1, 2-dibromoheptene

It is a trans intermediate on further halogenations produces a tetrabromopentane.  

It is an electrophilic expansion response in which the triple bond breaks to turn into a twofold bond and creates a dibromoalkene (E-1,2 dibromoheptene), and on further expansion, the twofold bond turns into a solitary bond and delivers a tetrabromoalkane.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3