JEE Chemistry Carbon And Its Compounds MCQs A

Question. Ethane, with the molecular formula C₂H₆ has
(a) 6 covalent bonds
(b) 7 covalent bonds
(c) 8 covalent bonds
(d) 9 covalent bonds

Answer : B

Question. Butanone is a four-carbon compound with the functional group
(a) Carboxylic acid
(b) aldehyde
(c) ketone
(d) alcohol

Answer : C

Question. While cooking, if the bottom of the vessel is getting blackened on the outside, it means that
(a) the food is not cooked completely
(b) the fuel is not burning completely
(c) the fuel is wet
(d) the fuel is burning completely

Answer : B

Question. A covalent bond is formed by
(a) complete transfer of electrons
(b) one sided sharing of electron
(c) mutual sharing of electron
(d) all of the three above.

Answer : C

Question. Which of the following compounds does not contain a multiple bond?
(a) Ethane
(b) Ethene
(c) Ethyne
(d) Benzene

Answer : A

Question. Which of the following is not a saturated hydrocarbon?
(a) Cyclohexane
(b) Benzene
(c) Butane
(d) Isobutane

Answer : B

Question. Benzene with molecular formula, C₆H₆, has
(a) 6 single bonds and 6 double bonds
(b) 12 single bonds and 3 double bonds
(c) 18 single bonds only
(d) 12 double bonds only

Answer : B

Question. The functional group in methanol and methanal respectively are :
(a) –OH, –CHO
(b) –CHO, –OH
(c) –OH, –COOH
(d) –CHO, –COOH

Answer : A

Question. Which of the following is not an allotropic form of carbon?
(a) Coal
(b) Fullerene
(c) Diamond
(d) Graphite

Answer : A

Question. Graphite is a soft lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
(a) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
(b) is a non-crystalline substance
(c) is an allotropic form of carbon
(d) has only single bonds between carbon atoms

Answer : A

Question. Which of the following represent the correct order of unsaturation?
(a) Alkanes, alkenes, alkynes
(b) Alkanes, alkynes, alkenes
(c) Alkenes, alkynes, alkenes
(d) Alkynes, alkanes, alkenes

Answer : A

Question. The general formula of alcohol is
(a) C_nH_2n+2OH
(b) C_nH_2n+1OH
(c) C_nH_2n–1OH
(d) C_nH_2n+4OH

Answer : B

Question. Wine contains
(a) CH₃OH
(b) C₆H₅OH
(c) C₂H₅OH
(d) CH₃COOH

Answer : C

Question. The acid present in vinegar is
(a) CH₃COOH
(b) HCOOH
(c) CH₃CH₂COOH
(d) CH₃CH₂CH₂COOH

Answer : A

Question. The reaction 2C₂H₅OH + 2Na → 2C₂H₅ONa + H₂ suggests that ethanol is
(a) Acidic in nature
(b) Basic in nature
(c) Amphoteric
(d) Neutral

Answer : A

Question. Which of the following substance is added to denature ethanol?
(a) Methanol
(b) Benzene
(c) Copper nitrate
(d) Poision

Answer : A

Question. Which of the following substances cannot be used to distinguish ethanol from ethanoic acid?
(a) Na metal
(b) NaHCO₃
(c) hot alkaline KMnO₄ solution
(d) hot acidified K₂Cr₂O₇ solution

Answer : A

Question. An example of soap is
(a) CH₃COONa
(b) CH₃ONa
(c) C₁₇H₃₅COONa
(d) C₁₇H₃₅COOC₂H₅

Answer : C

Question. Detergents are sodium or potassium salts of long chain
(a) aldehydes
(b) ketones
(c) carboxylic acids
(d) sulphonic acids

Answer : D

Question. Which of the following salts when dissolved in water produce hard water?
(a) Calcium sulphate
(b) Magnesium bicarbonate
(c) Calcium chloride
(d) Any of the above

Answer : D

Question. Which of the following has the shortest carboncarbon bond length?
(a) C₂H₂
(b) C₂H₄
(c) C₂H₆
(d) All have the same bond length

Answer : A

Question. Which of the following has the weakest carboncarbon bond strength?
(a) C₂H₂
(b) C₂H₄
(c) C₂H₆
(d) All have the same bond length

Answer : C

Question. The hydrocarbon with the general formula C_nH_2n+2 is an -
(a) Alkane
(b) Alkene
(c) Alkyne
(d) unsaturated compounds

Answer : A

Question. Which of the following is an alkyne ?
(a) C₆H₆
(b) C₆H₁₂
(c) C₆H₁₀
(d) C₆H₁₄

Answer : C