851.

The statement true for ${\mathrm{N}}_3^{-}$ is

• it has a non-linear structure

• it is called pseudohalogen

• the formal oxidation state of nitrogen in this anion is -1

• it is isoelectronic with NO₂

Which of the following molecule has highest bond energy ?

• F-F

• N-N

• C-C

• O-O

Shape of O₂F₂ is similar to that of

• C₂F₂

• H₂O₂

• H₂F₂

• C₂H₂

The ONO angle is maximum in

• ${\mathrm{NO}}_3^{-}$

• ${\mathrm{NO}}_2^{-}$

• ${\mathrm{NO}}_2$

• ${\mathrm{NO}}_2^{+}$

The number of $\mathrm{\sigma }$ and $\mathrm{\pi }$ bonds present in pent-4-ene, I-yne is :

• 10 , 3

• 4 , 9

• 3 , 10

• 9 , 4

The dipole moment is the highest for

• trans-2-butene

• 1,3-dimethylbenzene

• acetophenone

• ethanol.

Which of the following are arranged in the decreasing order of dipole moment?

• CH₃Cl, CH₃Br, CH₃F

• CH₃Br, CH₃Cl, CH₃F

• CH₃Cl, CH₃Br, CH₃F

• CH₃Br, CH₃F, CH₃Cl

Assertion : The free gaseous Cr atom has six unpaired electrons.

Reason: Half-filled s orbital has greater stability.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : All F- S -F angle in SF₄ is greater than 90° but less than 180°.

Reason : The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Which of the following compounds possesses the C-H bond with the lowest bond dissociation energy?

• Toluene

• Benzene

• n-Pentane

• 2,2-Dimethylpropane