Your Chemistry Paper is Here - Class 12 Boards Chemistry

## Class 12 Chemistry: Key Exam Concepts and Patterns The exam consists of four sections: Section A (10 MCQs, 1 mark each), Section B (9 questions, 2 marks each), Section C (9 questions, 3 marks each), and Section D (3 questions, 5 marks each). Three series (A, B, C) are...

What are colligative properties useful for?

Determining molar mass

Which of the following statements concerning 3, 4-Dibromopent-1-ene and 3,5-Dibromopent-2-ene are correct?

(I) They have same molecular formula $\mathrm{C}_{5} \mathrm{H}_{8} \mathrm{Br}_{2}$C5​H8​Br2​

(II) They are positional isomers.

(III) They have similar chemical properties.

I and II only

What are colligative properties useful for?

Determining molar mass

Which of the following statements concerning 3, 4-Dibromopent-1-ene and 3,5-Dibromopent-2-ene are correct?

(I) They have same molecular formula $\mathrm{C}_{5} \mathrm{H}_{8} \mathrm{Br}_{2}$C5​H8​Br2​

(II) They are positional isomers.

(III) They have similar chemical properties.

I and II only