JEE Chemistry Carbon And Its Compounds Notes

Question. Fullerence, an allotrope of carbon contains -
(A) 30 six membered rings
(B) 24 five membered rings and 10 six membered rings.
(C) 12 five membered rings and 20 six membered rings
(D) 18 five membered rings and 15 six membered rings.
Answer : C

Question. Which of the following series represent only unsaturated hydrocarbons ?
(A) C₂H₆, C₃H₈, C₄H₁₀
(B) C₂H₆, C₃H₆, C₄H₁₀
(C) C₂H₄ , C₃H₆, C₄H₆
(D) C₂H₄, C₃H₈, C₄H₆
Answer : C

Question. Which of the following formulae represents cycloalkanes ? 
(A) C6H12
(B) C4H10
(C) C6H6
(D) C5H14 sw
Answer : B

Question. Which of the following may be isomer of aldehyde having general formula CnH2nO ?
(A) Alcohol
(B) Ether
(C) Ester
(D) Ketone
Answer : D

Question. What is IUPAC name of the following compound ? CH₃—CH₂—CH₂—OH 
(A) Propan-1-ol
(B) Propan-2-ol
(C) Ethan-1-ol
(D) Ethan-2-ol
Answer : A

Question. The action of cleaning of oily dirt by soap is based on 
(A) solubility in water
(B) hydrophilic property
(C) hydrophobic property
(D) presence of both hydrophilic and hydrophobic groups
Answer : D

Question. Detergents are salts of - 
(A) strong acid and strong base
(B) strong acid and weak base
(C) weak acid and strong base
(D) weak acid and weak base
Answer : A

Question. In the presence of concentrated sulphuric acid, acetic acid reacts with alcohol to produce –
(A) aldehyde
(B) alcohol
(C) ester
(D) carboxylic acid
Answer : C

Question. Which of the following is represented by general formula C_nH_2n+2O ?
(A) Alcohols only
(B) Both alcohols and ethers
(C) Aldehydes only
(D) Both Aldehydes and ketones
Answer : B

Question. IUPAC name of the first member of homologous series of ketones is 
(A) Ethanone
(B) Propanol
(C) Methanone
(D) Propanone
Answer : D

Question. Ethanol is made unfit for drinking by adding 
(A) Propanol
(B) Methanal
(C) Methanol
(D) Ethanal
Answer : C

Question. 1 mole of a hydrocarbon ‘X’ undergoes complete saturation with 1 mole of hydrogen in presence of a heated catalyst. What would be the formula of ‘X’ ? 
(A) C₂H₆
(B) C₂H2
(C) C₅H₁₀
(D) C₇H₁₆
Answer : C

Question. Which of the following are isomers ? 
(A) Butane and Isobutene
(B) Ethane and Ethene
(C) Propane and Propyne
(D) Butane and Isobutane
Answer : D

Question. Which of the following has shortest carbon-carbon bond length ?
(A) C₂H₂
(B) C₂H₄
(C) C₂H₆
(D) C₆H₆
Answer : A

Question. A hydrocarbon having one double bond has 100 carbon atoms in its molecule.The number of hydrogen atoms in its molecule will be: 
(A) 196
(B) 198
(C) 200
(D) 202
Answer : C

Question. The first organic compound which was synthesized in the laboratory was
(A) Methane
(B) Urea
(C) Acetic acid
(D) Cane sugar
Answer : B

Question. An alkyne has 4 numbers of hydrogen atoms. What will be the number of carbon atoms in it ?
(A) Two
(B) Three
(C) Four
(D) Five
Answer : B

Question. In saponification process, the fatty acid present in the oils is neutralised by adding
(A) Sodium hydroxide
(B) Aluminium hydroxide
(C) Calcium hydroxide
(D) Magnesium hydroxide
Answer : A

Question. Acetic acid, with the molecular formula CH3 COOH has
(A) 8 covalent bonds
(B) 7 covalent bonds
(C) 9 covalent bonds
(D) 10 covalent bonds.
Answer : A

Question. (a) If the assertion as well as reason are correct and the reason is the correct explanation of the assertion.
(b) If the assertion as well as the reason are correct, but reason is not the correct explanation of the assertion
(c) If the assertion is correct but reason is not
(d) If the reason is correct but assertion is not
Assertion : Graphite is chemically more reactive than diamond.
Reason : Diamond is very hard but graphite is soft.
Choose the correct answer :
(A) (a)
(B) (b)
(C) (d)
(D) (a)
Answer : B

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