Assertion : $H C H O$ has $s p^{2} -$ hybridised carbon. Reason: The bond angles are changed due to multiple bond $-$ bond pair repulsion.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is correct but Reason is incorrect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both Assertion and Reason are incorrect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Formaldehyde had 3 sigma bonds, hence ${s p}^{2}$ hybridized.
Small distortions from the ideal angles result from differences in repulsion between various regions of electron density. VSEPR theory predicts these distortions by establishing an order of the amount of space occupied by different kinds of electron pairs. The order of electrons-pair repulsions from greatest to least repulsion is:
$L o n e p a i r - l o n e p a i r > l o n e p a i r - b o n d i n g p a i r > b o n d i n g p a i r - b o n d i n g p a i r$
This order of repulsions determines the amount of space occupied by different regions of electrons. A line pairs of electrons occupies a larger region of space than the electrons in a triple bond; in turn, electrons in a triple bond occupy more space than those in a double bond, and so on. The order of sizes from largest to smallest is:
$l o n e p a i r > t r i p l e b o n d > d o u b l e b o n d > s i n g l e b o n d$
formaldehyde, $H_{2} C O$ , has regions of high electron density that consist of two single bonds and one double bond. The basic geometry is trigonal planar with 120° bond angles, but we see that the double bond causes slightly larger angles(121°), and the angle between the single bonds is slightly smaller (118°).

Suggest Corrections

Similar questions

Q. Assertion : In the bonding molecular orbital (MO) of

H_{2}

, the electron density is increased between the nuclei.
Reason : The bonding MO is

ψ_{A} + ψ_{B}

, which shows destructive interference of the combining electron waves.

Statement-1 : In (cyclobutadiene) all C-C bond lengths are equal.

Statement-2 : Cyclobutadiene is aromatic and the

Π

orbitals are orthogonal to each other.

The Assertion and Reason are given, you are required to choose any one of the following four responses.

A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C) The Assertion is correct but Reason is incorrect

D) Both Assertion and Reason are incorrect

Assertion (A) Bond angle in ethers is slightly less than the tetrahedral angle.
Reason (R) There is a repulsion between the two bulky (- R) groups.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Boiling points of alcohols and ethers are high.
Reason (R) They can form intermolecular hydrogen-bonding.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Join BYJU'S Learning Program

Assertion :HCHO has sp2− hybridised carbon. Reason: The bond angles are changed due to multiple bond − bond pair repulsion.

Assertion : $H C H O$ has $s p^{2} -$ hybridised carbon. Reason: The bond angles are changed due to multiple bond $-$ bond pair repulsion.