Chemistry MCQS for Class 10 Chapter 4

Some orchids attracts bees for pollination by producing.

alkynes

all the above.

almenes

alkanes

Oxidation of ethene with KMnO₄produces.

glyoxal

Propene glycol

ethene glycol

oxalic acid

One of the hydrocarbons reacts with one mole of hydrogen to form a saturated hydrocarbon. What is the formula could be of the x:

C₃H₈

C₄H₁₀

C₂H₁₆

C₆H₁₂

The reduction of alkyl halides takes place in the presence of

Cu/HCl

Na/HCl

Zn/HCl

Mg/HCl

Dehalogenation of tetrahalides produces acetylene. This reaction takes place in the presence of

Zinc metal

Potassium metal

Sodium metal

Magnesium metal

By which process alkenes are prepared from alcohols:

Dehydrogenation

Dehydration

Dehydro-halogenation

Dehelogenation

One of the hydrocarbons reacts with one mole of hydrogen to form a saturated hydrocarbon. What formula could be of the X.

C₇H₁₆

C₆H₁₂

C₃H₈

C₄H₁₀

Which one of the following is polmerized to from benzene?

methane

ethene

ethane

ethyne

Molecular formula of butyne is .

C₄ H₆

C₃H₄

C₄H₇

C₄H₈

Ethen is prepared by heating a mixture of ethanol and excess of concentrated sulphuric acid at:

180°C

400°C – 450°C

150°C

250°C – 300°C