Recent questions tagged class11

Which of the following represent the correct order of increase in covalent character?

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Which of the following represent the correct order of decrease in covalent character?

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Which of the following represent the correct order of increase in covalent character?

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Which of the following represent the correct order of decreasing lattice energy?

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Which of the following compounds does not obey the octet rule?

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Which of the following does not obey the octet rule?

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Which of the following obeys the octet rule?

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Which one of the following oxides is expected to exhibit paramagnetic behavior?

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The bond order of $[He_2]^{4-}$ is

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In which case electron from bonding molecular orbital is removed?

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$BrO_3^-$ is isostructural with a noble gas species

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The number of anti-bonding electrons in CO molecules is

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In allene, hybridization of the central and terminal carbons, respectively, are

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Which of the following molecule exhibits the largest bond angle?

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Molecular orbital theory predicts the $F_2^{2+}$ ion has a bond order of

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The number of electrons in the $\sigma$ 2p molecular orbital in $N_2^+$ is

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The hybridisation and shape of the $[Pt(Cl)_4]^{2-}$ is

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In $C_2H_5OH$, which type of hydrogen bond can be observed

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In most stable structure of $ClF_3$ molecule, how many lone pairs are there in equatorial positions

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The number of $\pi-$bonds in ethane, ethene and ethyne are respectively

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According to VSEPR theory, which of the following is non-linear molecule

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A cylinder rolls without slipping on a rough horizontal floor, its centre of mass moving with speed v. It makes an elastic collision with a smooth vertical wall. After impact

asked Dec 5, 2013 by meena.p

1 answer

A circular wooden loop of mass m and radius R rest on a flat horizontal friction less surface. A bullet, also of mass m, and moving with a velocity V, strikes the loop and gets embedded in it. The thickness of the loop is much smaller than R. The angular velocity with which the system angular velocity with which the system rotates just after the bullet strikes the loop is

asked Dec 5, 2013 by meena.p

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A body is given translational velocity and kept on a surface that has sufficient friction. Then

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A sphere is released on a smooth inclined plane from the top. When it moves down its angular momentum is

asked Dec 5, 2013 by meena.p

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A sphere S rolls without slipping, moving with constant speed on a plank p. The friction between the upper surface of P and the sphere is sufficient to prevent slipping, While the lower surface of p is smooth and rest on the ground. Initially P is fixed to the ground by a pin N. If N is suddenly removed :

asked Dec 5, 2013 by meena.p

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A thin spherical shell lying on a rough horizontal surface is hit by a cue in such a way that the line of action passes through the centre of the shell. As a result the shell starts moving with a linear speed V with out any initial angular velocity. Find the speed of the shell after it starts pure rolling on the surface .

asked Dec 5, 2013 by meena.p

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Consider the following reaction of 1-methyl cyclohexene with NBS.Four likely products of the reaction are shown below. One of the likely product is not shown however

asked Dec 5, 2013 by sreemathi.v

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A uniform wheel of radius R is set into rotation about its axis at an angular speed w.This rotating wheel is now placed on a rough horizontal surface with its axis horizontal. Because of friction at the contact , the wheel accelerated forward and its rotation decelerates till the wheel starts pure rolling on the surfaces . Find the linear speed of the wheel after it starts pure rolling.

asked Dec 5, 2013 by meena.p

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Figure shows a rough track, a portion of which is in the form of a cylinder of radius R. with what minimum linear speed should a sphere of radius r be set rolling on the horizontal part so that it completes goes round the circle on the cylindrical part?

asked Dec 5, 2013 by meena.p

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Reactant B of the reaction is

asked Dec 5, 2013 by sreemathi.v

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The reactivity of which H atom is maximum for Halogenation by free radical mechanism?

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Refer to the below reaction :

asked Dec 5, 2013 by sreemathi.v

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Reaction of 1 molr of each $Br_2$ and phco$CH_2CH_3$ in basic solution yields 0.5 moles of ph$COCBr_2CH_3$ And 0.5 moles of unreacted ph$COCH_2CH_3$. It suggests:

asked Dec 5, 2013 by sreemathi.v

1 answer

Which radical is responsible for the observed selectivity in the following selectivity in the following chain reaction ?

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1 answer

DImerisation product of cyclhexene under acidic conditions is

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Which alkene when treated with benzene in presence of $H^+$ gives 1,1 diphenylethane

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Bromination of carbonyl compound at $\alpha$ position is

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Refer to the below equation :

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Which of the following is likely mechanism for the transformation shown below?

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Which is the least likely protonation site in the conjugated alkene given below:

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3 answers

Refer to the below reaction:

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1 answer

What is the most likely product of the following reaction?

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1 answer

Refer to the below equation :

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Refer to the below reaction :

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1 answer

Refer to the below reaction :

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An aromatic alkyne on treatment with $H_2SO_4$ gives acetophenone .The alkyne is

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An alkyne on treatment with cold alkaline $KMnO_4$ gives $2-oxo$ propanal. Alkyne is

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Refer to the below reaction:

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Refer to the below reaction :

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