SSC CGL Science – Carbon & Its Compounds; Polymers & Fuels – Level 3 · Challenge
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Answer: 12. CₙH₂ₙ₋₂ → 12.
₹299 →
SSC CGL Science – Carbon & Its Compounds; Polymers & Fuels – Level 3 · Challenge – 8 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
How many structural isomers does hexane (C₆H₁₄) have?
Correct Answer: A [5]
Explanation:
Answer: 5. Enumeration gives 5.
2.
In the balanced equation for complete combustion of ethene (C₂H₄), the coefficient of O₂ is:
Correct Answer: A [3]
Explanation:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O; 2 + 4/4 = 3.
3.
Arrange in orderArrange in increasing order of calorific value: petrol, cow dung cake, hydrogen, biogas.
Correct Answer: D [cow dung cake < biogas < petrol < hydrogen]
Explanation:
8000 < 40000 < 45000 < 150000.
4.
A hydrocarbon of molecular mass 54 u belongs to the alkyne series. It is:
Correct Answer: B [butyne]
Explanation:
CₙH₂ₙ₋₂: 14n − 2 = 54 → n = 4, C₄H₆.
5.
Statement-basedWhich are correct?
I. Members of a homologous series differ by CH₂.
II. Their chemical properties are similar.
III. Their physical properties are identical.
I. Members of a homologous series differ by CH₂.
II. Their chemical properties are similar.
III. Their physical properties are identical.
Correct Answer: C [Only I and II]
Explanation:
Physical properties change gradually with mass.
6.
Ethanol heated with excess concentrated sulphuric acid at 443 K gives:
Correct Answer: A [ethene]
Explanation:
Dehydration: C₂H₅OH → C₂H₄ + H₂O.
7.
The product of CH₃COOH + C₂H₅OH (with conc. H₂SO₄) is:
Correct Answer: B [CH₃COOC₂H₅]
Explanation:
Esterification gives ethyl ethanoate (sweet smell).
8.
The number of hydrogen atoms in the alkyne with 7 carbon atoms is:
Correct Answer: D [12]
Explanation:
Answer: 12. CₙH₂ₙ₋₂ → 12.
➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science
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