Properties of Haloacids

Q.

Explain on the basis of valence bond theory that [Ni(CN)₄]²⁻ ion with square

planar structure is diamagnetic and the [NiCl₄]²⁻ ion with tetrahedral geometry is paramagnetic.

Q. Strongest hydrogen bonding is shown by

1. ammonia
2. hydrogen fluoride
3. Water
4. hydrogen sulphide

Q. Bond strength of Hydrogen halides decreases in the order:

1. $H-F>H-I>H-Br>H-Cl$
2. $H-Cl>H-F>H-Br>H-I$
3. $H-F>H-Cl>H-I>H-Br$
4. $H-F>H-Cl>H-Br>H-I$

Q. The acidity (acid strength) of halo acids increases in the order:

1. 
2. 
3. 
4. 

Q.

Why do covalent compounds exist as gases, liquids, or soft solids?

Q.

Discuss the nature of bonding in metal carbonyls.

Q. Statement I : Acid strength increases in the order given as $HF<<HCl<<HBr<<HI.$
Statement II : As the size of the elements $F,Cl,Br,I$ increases down the group, the bond strength of $HF,HCl,HBrandHI$ decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below

1. Statement I is incorrect but Statement II is true
2. Both statement I and Statement II are true
3. Both Statement I and Statement II are false
4. Statement I is correct but statement II is false

Q. The molecular formula of a compound is C10H10 its structure has 5 double bonds in conjugations and a cycle is also there is this compound aromatic

Q. In the given compounds, arrow indicate direction of inductive effect. Choose the compound(s) in which direction of inductive effect shown is correct

1. 
2. 
3. 
4. 

Q.

Suggest reasons why the B–F bond lengths in BF₃ (130 pm) and (143 pm) differ.

Q. Strongest hydrogen bonding is shown by

1. Water
2. ammonia
3. hydrogen fluoride
4. hydrogen sulphide

Q. Explain why $({CH}_3{)}_3\stackrel{+}{C}$ is more stable than ${CH}_3\stackrel{+}{C{H}_2}$ and $\stackrel{+}{C{H}_3}$ is the least stable cation.

Q. Arrange stability of the given carbocations in decreasing order.

1. $I>II>III>IV$
2. $III>II>I>IV$
3. $IV>I>II>III$
4. $II>III>I>IV$

Q. The more favorable condition for ionic bonding are:

1. low charge on ions, large cation and small anion
2. low charge on ions, large cation and large anion
3. high charge on ions, small cation and large anion
4. high charge on ions, large cation and small anion

Q. The stability of $1^{\circ }$, $2^{\circ }$, $3^{\circ }$ carbocation and benzyl carbocations is of the order :

1. $1^{\circ }>2^{\circ }>3^{\circ }>benzyl$
2. Benzyl >$3^{\circ }>2^{\circ }>1^{\circ }$
3. $3^{\circ }>2^{\circ }>1^{\circ }>benzyl$
4. $3^{\circ }>benzyl>2^{\circ }>1^{\circ }$

Q. why the energy gap b/w bonding and antibonding decrease when no. of atoms increase

Q. Among HCI, HBr, HF, and HI the weakest acid in water is

1. HCI
2. HF
3. HBr
4. HI

Q. Which is more reactive towards Na: tertiary alcohol or primary alcohol?

Q. Chlorine reacts with hot and concentrated $NaOH$ and produces compounds (X) and (Y). Compound (X) gives white precipitate with silver nitrate solution. The average bond order between $Cl$ and $O$ atoms in (Y) is t; find 3t.

Q. Choose the correct sequence for the geometry of the given molecules Borazone, Borazole, $B_3{O}_6^{3-},F{e}_{2}C{l}_6$, trimer of FCN.
['P' stands for planar anf 'NP' stands for non-planar]

1. NP, P, NP, P, P
2. NP, NP, NP, P, P
3. P, P, NP, NP, P
4. NP, P, P, NP, P

Q. In which of the following compounds, H-bonding is strongest in the liquid phase?

1. $HF$
2. $HI$
3. $P{H}_3$
4. $C{H}_4$

Q. Cyanide ion acts as an ambident necleophile. From which end it acts as a stronger nucleophile in aqueous medium?

1. It acts as a stronger necleophile from carbon end.
2. It acts as a stronger necleophile from nitrogen end.
3. It has same strength from both the ends.
4. It depends on the nature of the alkyl halide.

Q. Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is:

1. $C{H}_{3}COCl$
2. $C{H}_{3}CHO$
3. $C{H}_{3}COOC{H}_3$
4. $C{H}_{3}COOCOC{H}_3$

Q. arrange the following alcohols in the order of increasing reactivity towards lucas reagent.
2-butalnal .1-butanal , 2-methyl-2-propanol

Q. H-F forms hydrogen bonding - True or False?

1. True
2. False

Q. Assertion :Silicones are very inert polymers. Reason: Both $Si-O$ and $Si-C$ bond energies are very high.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q. Phenol is:

1. an acid stronger than carbonic acid
2. a base weaker than ammonia
3. an acid weaker than carbonic acid
4. a neutral compound

Q.

explain why inspite of the nearlysame electronegativity oxygen forms hydrogen bonding but chlorine does not.

Q. Which of the following bonds is likely to have the most ionic character?

1. Carbon-carbon bond
2. Oxygen-lithium bond
3. Carbon-oxygen bond
4. Fluorine-lithium bond

Q. Assertion :The strength of haloacids increases in the order:
$HI<<HBr<<HCl<<HF$ Reason: Strength of acid HA depends only on the electronegativity difference between $H$ and $A$

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect