| 2101 |
Which complex shows cis–trans (geometrical) isomerism? |
Chemistry
Isomerism |
Easy |
| 2102 |
[Co(NH₃)₅(SO₄)]Br and [Co(NH₃)₅Br]SO₄ give different ions in solution. What type of isomers are they? |
Chemistry
Isomerism |
Medium |
| 2103 |
Which complex is optically active? |
Chemistry
Isomerism |
Medium |
| 2104 |
Why is trans-[PtCl₂(en)₂]²⁺ optically inactive while the cis isomer is optically active? |
Chemistry
Isomerism |
Hard |
| 2105 |
In an octahedral crystal field, which set of d orbitals is lower in energy? |
Chemistry
Bonding: VBT and CFT |
Easy |
| 2106 |
Which ligand produces the strongest crystal field splitting? |
Chemistry
Bonding: VBT and CFT |
Easy |
| 2107 |
What is the hybridisation and magnetic behaviour of [Ni(CN)₄]²⁻? |
Chemistry
Bonding: VBT and CFT |
Medium |
| 2108 |
For a d⁴ ion in an octahedral field, what is the electron configuration when Δo is greater than the pairing e… |
Chemistry
Bonding: VBT and CFT |
Medium |
| 2109 |
What is the spin-only magnetic moment of [CoF₆]³⁻? |
Chemistry
Bonding: VBT and CFT |
Hard |
| 2110 |
Which metal is present in chlorophyll? |
Chemistry
Metal carbonyls and applications |
Easy |
| 2111 |
What is the shape of [Ni(CO)₄]? |
Chemistry
Metal carbonyls and applications |
Easy |
| 2112 |
In synergic bonding in metal carbonyls, into which orbitals of CO does the metal donate electron density? |
Chemistry
Metal carbonyls and applications |
Medium |
| 2113 |
Which coordination compound is used in the treatment of some types of cancer? |
Chemistry
Metal carbonyls and applications |
Medium |
| 2114 |
How is EDTA used to estimate the hardness of water? |
Chemistry
Metal carbonyls and applications |
Hard |
| 2115 |
Which compound is an allylic halide? |
Chemistry
Classification, nomenclature and the C–X bond |
Easy |
| 2116 |
What is the IUPAC name of (CH₃)₃CBr? |
Chemistry
Classification, nomenclature and the C–X bond |
Easy |
| 2117 |
CH₃CHCl₂ is classified as a: |
Chemistry
Classification, nomenclature and the C–X bond |
Medium |
| 2118 |
Which carbon–halogen bond has the highest bond enthalpy? |
Chemistry
Classification, nomenclature and the C–X bond |
Medium |
| 2119 |
Why is benzyl chloride (C₆H₅CH₂Cl) placed in the sp³ C–X category while chlorobenzene is placed in the sp² C–… |
Chemistry
Classification, nomenclature and the C–X bond |
Hard |
| 2120 |
Which reagent is preferred for converting an alcohol into an alkyl chloride? |
Chemistry
Preparation and physical properties |
Easy |
| 2121 |
Which reaction converts bromoethane into iodoethane? |
Chemistry
Preparation and physical properties |
Easy |
| 2122 |
Arrange CH₃Cl, CH₃Br and CH₃I in order of increasing boiling point. |
Chemistry
Preparation and physical properties |
Medium |
| 2123 |
Which isomer of C₄H₉Br has the lowest boiling point? |
Chemistry
Preparation and physical properties |
Medium |
| 2124 |
Propene reacts with HBr in the presence of benzoyl peroxide. What is the major product? |
Chemistry
Preparation and physical properties |
Hard |
| 2125 |
Which haloalkane reacts fastest by the SN2 mechanism? |
Chemistry
Chemical reactions |
Easy |
| 2126 |
What is the major product when 2-bromobutane is heated with alcoholic KOH? |
Chemistry
Chemical reactions |
Easy |
| 2127 |
Which product is mainly formed when an alkyl bromide reacts with AgCN? |
Chemistry
Chemical reactions |
Medium |
| 2128 |
The rate of hydrolysis of (CH₃)₃CBr in aqueous solution does not change when the hydroxide ion concentration … |
Chemistry
Chemical reactions |
Medium |
| 2129 |
Why is chlorobenzene much less reactive than chloroethane towards nucleophilic substitution? |
Chemistry
Chemical reactions |
Hard |
| 2130 |
Which molecule contains a chiral carbon atom? |
Chemistry
Stereochemistry |
Easy |
| 2131 |
Why is a racemic mixture optically inactive? |
Chemistry
Stereochemistry |
Easy |
| 2132 |
What stereochemical result is expected when optically active 2-bromobutane reacts with OH⁻ by the SN2 mechani… |
Chemistry
Stereochemistry |
Medium |
| 2133 |
An optically active tertiary halide undergoes hydrolysis by the SN1 mechanism. What is the main stereochemica… |
Chemistry
Stereochemistry |
Medium |
| 2134 |
How do two enantiomers of 2-bromobutane differ from each other? |
Chemistry
Stereochemistry |
Hard |
| 2135 |
Why is chloroform stored in closed, dark-coloured bottles filled to the brim? |
Chemistry
Polyhalogen compounds |
Easy |
| 2136 |
What is the chemical formula of iodoform? |
Chemistry
Polyhalogen compounds |
Easy |
| 2137 |
Why was iodoform once used as an antiseptic? |
Chemistry
Polyhalogen compounds |
Medium |
| 2138 |
Why are freons harmful even though they are non-toxic and unreactive at ground level? |
Chemistry
Polyhalogen compounds |
Medium |
| 2139 |
Why does DDT become more concentrated in animals higher up a food chain? |
Chemistry
Polyhalogen compounds |
Hard |
| 2140 |
Which of these is a tertiary alcohol? |
Chemistry
Classification and nomenclature |
Easy |
| 2141 |
What is the IUPAC name of anisole, C₆H₅OCH₃? |
Chemistry
Classification and nomenclature |
Easy |
| 2142 |
What is the common name of benzene-1,3-diol? |
Chemistry
Classification and nomenclature |
Medium |
| 2143 |
Why is the C–O bond in phenol shorter than the C–O bond in methanol? |
Chemistry
Classification and nomenclature |
Medium |
| 2144 |
Why is the C–O–C bond angle in dimethyl ether slightly larger than the tetrahedral angle? |
Chemistry
Classification and nomenclature |
Hard |
| 2145 |
What is the main product of acid-catalysed hydration of propene? |
Chemistry
Preparation of alcohols and phenols |
Easy |
| 2146 |
Which pair of products is formed in the cumene process? |
Chemistry
Preparation of alcohols and phenols |
Easy |
| 2147 |
Which method converts propene into propan-1-ol? |
Chemistry
Preparation of alcohols and phenols |
Medium |
| 2148 |
Which carbonyl compound gives a primary alcohol other than methanol when treated with CH₃MgBr followed by hyd… |
Chemistry
Preparation of alcohols and phenols |
Medium |
| 2149 |
A student wants 2-methylpropan-2-ol using a Grignard reagent. Which combination is suitable? |
Chemistry
Preparation of alcohols and phenols |
Hard |
| 2150 |
Why does ethanol have a much higher boiling point than methoxymethane, although both are C₂H₆O? |
Chemistry
Properties of alcohols |
Easy |