SSC CGL Science – Carbon & Its Compounds; Polymers & Fuels – Tier II Level · Marathon

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SSC CGL Science – Carbon & Its Compounds; Polymers & Fuels – Tier II Level · Marathon – 10 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.  
The degree of unsaturation (rings + π bonds) of C₆H₁₀ is:

Correct Answer: C [2]

Explanation:

Answer: 2. (12 + 2 − 10) ÷ 2 = 2.

2.  
The IUPAC name of isobutane is:

Correct Answer: A [2-methylpropane]

Explanation:

Longest chain 3 carbons with a methyl on C-2.

3.  
The number of structural isomers of heptane (C₇H₁₆) is:

Correct Answer: C [9]

Explanation:

Answer: 9. Enumeration gives 9.

4.  
Volume of oxygen needed to burn 20 mL of methane completely (same T and p):

Correct Answer: D [40 mL]

Explanation:

Answer: 40 mL. CH₄ + 2O₂ → CO₂ + 2H₂O.

5.  
Number of O₂ molecules needed to burn two molecules of methanol (CH₃OH) completely:

Correct Answer: B [3]

Explanation:

2CH₃OH + 3O₂ → 2CO₂ + 4H₂O; per molecule 1 + 4/4 − 1/2 = 1.5, so 3 for two molecules.

6.  
Which polymer is a condensation polymer?

Correct Answer: A [Nylon-6,6]

Explanation:

Nylon-6,6 forms with loss of water; the others are addition polymers.

7.  
Which of these is a biodegradable polymer?

Correct Answer: B [PHBV]

Explanation:

PHBV is broken down by micro-organisms.

8.  
The monomer of natural rubber is:

Correct Answer: C [isoprene]

Explanation:

Natural rubber = polyisoprene.

9.  
The quality of diesel fuel is expressed by its:

Correct Answer: D [cetane number]

Explanation:

Octane – petrol; cetane – diesel.

10.  
Two-quantity comparison
Quantity I: number of isomers of pentane
Quantity II: number of isomers of butane

Correct Answer: D [Quantity I > Quantity II]

Explanation:

Answer: Quantity I > Quantity II. 3 > 2.

➤ 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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