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A gas mixture contains `50%` helium and `50%` methane by volume. What is the percent by weight of methane in the mixture.
A. `80.03%`
B. `20.05%`
C. `50%`
D. `75%`

The sodium extract on acidification with acetric acid and then adding lead acetate solution gives a black precipitate. The organic compound contains.
A. nitrogen
B. halogen
C. sulphur
D. phosphorus

Assertion `:` Glycerol is purified by distilled under reduced pressure.
Reason `:` Glycerol is a trihydric alcohol.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.
C. If the assertion is true but reason is false.
D. If assertion is false but reason is true.

Assertion `:` The yield in organic reactinos are `100%`
Reason `:` The organic reactions take place along with side reaction.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.
C. If the assertion is true but reason is false.
D. If assertion is false but reason is true.

Common name of ethyl isocynide is
A. Propionisonitrile
B. Acetoisonitrile
C. Isopropionitrile
D. Propanoisonitrile

Camphor is often used in molecular mass determination because
A. It is volatile
B. It is solvent for organic substances
C. It is readily available
D. It has a very high cryoscopic constant

The correct `IUPAC` name of the compound
image is:
A. `6-`Methyl`-1-`methyl`-4-`oxohept`-6-`ene`-1-`sulphonic acid
B. `7-`Ethyl`-5-`oxooct `-7-`ene`-2-`sulphonic acid
C. `2-`Ethyl `-7-`sulphooct `-1-`ene `-4-`one
D. `7-`Methylene `-5-`oxononane `-2-`sulphonic acid

What is the `IUPAC`name of the following compound ?
image
A. `5-`bromo`-2-`heptyne
B. `5-`bromo`-5-`methyl`-2-`hexyne
C. `5-`bromo`-5,5-`dimethyl hexyne
D. `2-`bromo`-2-`methyl`-4-`hexyne

The correct `IUPAC` name of the compound
image
A. `2-`Phenoxycarbonylbenzenecarboxylic acid
B. Phenyl`-2-`carboxybenzenecarboxylate
C. `2-`Benzoyloxybenzenecarboxylic acid
D. `2-`Benzyloxycarbonylbenzenecarboxylic acid

What is the correct `IUPAC` name of image
A. Dioxy butane
B. `2,6-`dioxy butane
C. `1,2-`dimethoxy ethane
D. Dimethyl ethyl ether

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