PractifyUs

NEET Chemistry · Hydrocarbons

Alkynes: acidic character and addition reactions

Taught in NCERT Class 11 Chemistry, Chapter 9: Hydrocarbons.

1 verified question: Easy 0 · Medium 0 · NEET level 1

Sample questions

Sample 1NEET level

Assertion (A): Ethene is more acidic than ethyne. Reason (R): The carbon atoms in ethyne are sp hybridised and have 50% s character.

  1. A

    Both A and R are true and R is the correct explanation of A

  2. B

    Both A and R are true but R is not the correct explanation of A

  3. C

    A is true but R is false

  4. D

    A is false but R is true

Show the answer
The answer is D.

The sp carbon of ethyne has 50% s character, the highest electronegativity among sp, sp2 and sp3 carbons, so the hydrogen attached to it is released as a proton most easily. Ethyne is therefore more acidic than ethene, so A is false while R is true.

  • A.

    A is false, so R cannot explain it.

  • B.

    A is false: ethyne is more acidic than ethene.

  • C.

    A is false and R is true, the reverse of this option.

NCERT: Class 11 Chemistry, Unit 9 (Hydrocarbons), Alkynes: Chemical properties, Acidic character of alkyne

Practise Alkynes: acidic character and addition reactions

Practice at the level you choose, with the answer after every question; timed tests with the answers when you submit. Every question is verified against NCERT first.

Sign in to practise

More in Hydrocarbons