List of top Chemistry Questions

A hydrocarbon C5H10 does not react with chlorine in the dark but gives a single monochloro compound C5H9Cl in bright sunlight. Identify the hydrocarbon.

Which one of the following has the highest dipole moment?

(i)CH2Cl2

(ii)CHCl3

(iii)CCl4

Write the structures of the following organic halogen compounds.

(i) 2-Chloro-3-methylpentane

(ii)p-Bromochlorobenzene

(iii)1-Chloro-4-ethylcyclohexane

(iv)2-(2-Chlorophenyl)-1-iodooctane

(v)2-Bromobutane

(vi)4-tert-Butyl-3-iodoheptane

(vii)1-Bromo-4-sec-butyl-2-methylbenzene

(viii)1,4-Dibromobut-2-ene

How many geometrical isomers are possible in the following coordination entities? 
(i)\( [Cr(C_2O_4)_3]^{ 3–} \)
(ii)\( [Co(NH_3)_3Cl_3]\)

Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?
Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid

Complete the following reactions:

 

Using IUPAC norms write the systematic names of the following: 
(i)\( [Co(NH_3)_6]Cl_3 \)
(ii) \([Pt(NH_3)_2Cl(NH_2CH_3)]Cl \)
(iii) \([Ti(H_2O)_6]^{3+} \)
(iv) \([Co(NH_3)_4Cl(NO_2)]Cl \)
(v)\( [Mn(H_2O)_6]^{2+}  \)
(vi) \([NiCl_4]^{2–}\)
(vii) \([Ni(NH_3)_6]Cl_2   \)
(viii) \([Co(en)_3]^{3+} \) 
(ix)\( [Ni(CO)_4]\)

Give the structures of A, B and C in the following reactions: 

Using IUPAC norms write the formulas for the following: 
(i) Tetrahydroxidozincate(II) 
(ii) Potassium tetrachloridopalladate(II) 
(iii) Diamminedichloridoplatinum(II) 
(iv) Potassium tetracyanidonickelate(II) 
(v) Pentaamminenitrito-O-cobalt(III)
(vi) Hexaamminecobalt(III) sulphate ) 
(vii) Potassium tri(oxalato)chromate(III)  
(viii) Hexaammineplatinum(IV)  
(ix) Tetrabromidocuprate(II)  
(x) Pentaamminenitrito-N-cobalt(III)

Specify the oxidation numbers of the metals in the following coordination entities: 
(i)\( [Co(H_2O)(CN)(en)_2] ^{2+}\)
(ii) \([CoBr_2(en)_2]^{+}\)
(iii)\( [PtCl_4]^{ 2–} \)
(iv) \(K_3[Fe(CN)_6]\)
(v) \([Cr(NH_3)_3Cl_3] \)

What is meant by unidentate, didentate and ambidentate ligands? Give two examples for each.

Write short notes on the following: 

(i) Carbylamine reaction 

(ii) Diazotisation 

(iii) Hofmann’s bromamide reaction 

(iv) Coupling reaction 

(v) Ammonolysis 

(vi) Acetylation 

(vii) Gabriel phthalimide synthesis.

Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.
Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved.

\(FeSO_4\) solution mixed with\( (NH_4)_2SO_4 \) solution in\( 1:1\) molar ratio gives the test of \(Fe^{2+}\) ion but \(CuSO_4\) solution mixed with aqueous ammonia in \( 1:4 \) molar ratio does not give the test of \(Cu^{2+}\) ion. Explain why?

Explain the bonding in coordination compounds in terms of Werner’s postulates.

Write IUPAC names of the following compounds and classify them into primary, secondary and tertiary amines. 

(i) (CH3 )2CHNH2 (ii) CH3 (CH2 )2NH2 (iii) CH3NHCH(CH3 )2 

(iv) (CH3 )3CNH2 (v) C6H5NHCH3 (vi) (CH3CH2 )2NCH3 (vii) m–BrC6H4NH2

Alkali halides do not show Frenkel defect because
Which one of the following is tridentate ligand?
Laughing gas is prepared by heating
Number of oxalic acid molecules in $100\, mL$ of $0.02\, N$ oxalic acid are
Which of the following is an antihistamine drug?
Cyclopentadienyl anion is aromatic in nature. Cyclopentadienyl anion has six $\pi$ electrons.
Rusting of iron is catalysed by