Every Book Back multiple-choice question from Carbon and Its Compounds (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
The molecular formula of an open chain organic compound is C3H6. The class of the compound is
- A. alkane
- B. alkeneCorrect
- C. alkyne
- D. alcohol
Explanation. An open chain hydrocarbon with the general formula CnH2n corresponds to an alkene. Since C3H6 fits this formula for n equal to 3, it belongs to the alkene class.
Q2
The IUPAC name of an organic compound is 3-Methyl butan-1-ol. What type compound it is?
- A. Aldehyde
- B. Carboxylic acid
- C. Ketone
- D. AlcoholCorrect
Explanation. The IUPAC suffix -ol indicates the presence of a hydroxyl functional group (-OH), which is characteristic of alcohols.
Q3
The secondary suffix used in IUPAC nomenclature of an aldehyde is ____
- A. - ol
- B. - oic acid
- C. - alCorrect
- D. - one
Explanation. In IUPAC nomenclature, the functional group suffix for aldehydes is -al, whereas -ol is used for alcohols and -one for ketones.
Q4
Which of the following pairs can be the successive members of a homologous series?
- A. C3H8 and C4H10Correct
- B. C2H2 and C2H4
- C. CH4 and C3H6
- D. C2H5OH and C4H8OH
Explanation. Successive members of a homologous series differ by a -CH2- unit. Propane (C3H8) and butane (C4H10) both belong to the alkane series and differ by exactly one -CH2- group.
Q5
C2H5OH + 3O2 → 2CO2 + 3H2O is a
- A. Reduction of ethanol
- B. Combustion of ethanolCorrect
- C. Oxidation of ethanoic acid
- D. Oxidation of ethanal
Explanation. The reaction of ethanol with oxygen gas to produce carbon dioxide and water is a combustion reaction.
Q6
Rectified spirit is an aqueous solution which contains about _______ of ethanol
- A. 95.5 %Correct
- B. 75.5 %
- C. 55.5 %
- D. 45.5 %
Explanation. Rectified spirit is an aqueous ethanol solution obtained by fractional distillation containing 95.5% ethanol and 4.5% water.
Q7
Which of the following are used as anaesthetics?
- A. Carboxylic acids
- B. EthersCorrect
- C. Esters
- D. Aldehydes
Explanation. Ethers are organic compounds widely used as surgical anaesthetics.
Q8
TFM in soaps represents ___________ content in soap
- A. mineral
- B. vitamin
- C. fatty acidCorrect
- D. carbohydrate
Explanation. TFM stands for Total Fatty Matter, which measures the fatty acid content present in a soap.
Q9
Which of the following statements is wrong about detergents?
- A. It is a sodium salt of long chain fatty acidsCorrect
- B. It is sodium salts of sulphonic acids
- C. The ionic part in a detergent is –SO3 – Na+
- D. It is effective even in hard water.
Explanation. Soaps are sodium salts of long chain fatty acids, whereas detergents are sodium salts of sulphonic acids. Therefore, statement 1 is incorrect for detergents.
About these Carbon and Its Compounds questions
These are the Book Back multiple-choice questions for Carbon and Its Compounds from the Tamil Nadu State Board (Samacheer Kalvi) 10th Standard Science syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Carbon and Its Compounds?
This chapter has 9 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Carbon and Its Compounds book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
