JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Hydrocarbons

The incorrect statement regarding ethyne is

(A)The $C - C$ bonds in ethyne is shorter than that in ethene
(B)Both carbons are sp hybridised
(C)Ethyne is linear
(D)The carbon-carbon bonds in ethyne is weaker than that in ethene✓ Correct

Answer: (D)

Solution

In ethyne (H–C

\equiv

C–H), both carbons are sp hybridised and the molecule is linear.

The C–C bond in ethyne (triple bond) is shorter and stronger than the C–C bond in ethene (double bond) — bond order and bond strength increase from single to double to triple bonds while bond length decreases.

So the statement "the carbon-carbon bond in ethyne is weaker than in ethene" is incorrect.

JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Single correct option

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