Question

Which of the following shows the properties of Methane?
A. Soluble in water - no, state at room temperature – gas, gives a positive test with aqueous
bromine – no
B. Soluble in water – no, state at room temperature – gas, gives a positive test with aqueous
bromine - yes
C. Soluble in water – yes, state at room temperature – liquid, gives a positive test with aqueous bromine – no
D. Soluble in water -yes, state at room temperature – liquid, give a positive test with aqueous
bromine -yes

Answer 1

In the given question physical properties which include solubility in water, phase of methane at different temperature along with the aqueous bromine test, of a compound that is methane has been deliberated.

Complete Step by step answer: Methane is a modest gas, consisting of a single carbon atom attached with four arms of hydrogen atoms so the chemical compound has the chemical formula $C{H_4}$.
It is stated that at room temperature and standard pressure, methane is a colorless and odorless gas.
It is only slightly soluble in water. We know that methane is a nonpolar molecule that means these nonpolar molecules don't dissolve so well in water.
According to organic chemistry, the bromine test is a qualitative test for checking the presence of unsaturation that is carbon-to-carbon double or triple bonds. So, Methane does not give positive bromine tests due to absence of unsaturation.

Hence, option A is correct.

Note: Methane is lighter than air. Methane is a powerful greenhouse gas which is something$\;{\mathbf{28}}$ times more influential than that of carbon dioxide on warming the Earth's temperature, on an average ${\mathbf{100}}$-year life span and more than ${\mathbf{80}}$ times more powerful over ${\mathbf{20}}$ years.