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#	Question	Subject and topic	Difficulty
121	Which compound is an allylic halide?	Chemistry Classification, nomenclature and the C–X bond	Easy
122	What is the IUPAC name of (CH₃)₃CBr?	Chemistry Classification, nomenclature and the C–X bond	Easy
123	CH₃CHCl₂ is classified as a:	Chemistry Classification, nomenclature and the C–X bond	Medium
124	Which carbon–halogen bond has the highest bond enthalpy?	Chemistry Classification, nomenclature and the C–X bond	Medium
125	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
126	Which reagent is preferred for converting an alcohol into an alkyl chloride?	Chemistry Preparation and physical properties	Easy
127	Which reaction converts bromoethane into iodoethane?	Chemistry Preparation and physical properties	Easy
128	Arrange CH₃Cl, CH₃Br and CH₃I in order of increasing boiling point.	Chemistry Preparation and physical properties	Medium
129	Which isomer of C₄H₉Br has the lowest boiling point?	Chemistry Preparation and physical properties	Medium
130	Propene reacts with HBr in the presence of benzoyl peroxide. What is the major product?	Chemistry Preparation and physical properties	Hard
131	Which haloalkane reacts fastest by the SN2 mechanism?	Chemistry Chemical reactions	Easy
132	What is the major product when 2-bromobutane is heated with alcoholic KOH?	Chemistry Chemical reactions	Easy
133	Which product is mainly formed when an alkyl bromide reacts with AgCN?	Chemistry Chemical reactions	Medium
134	The rate of hydrolysis of (CH₃)₃CBr in aqueous solution does not change when the hydroxide ion concentration …	Chemistry Chemical reactions	Medium
135	Why is chlorobenzene much less reactive than chloroethane towards nucleophilic substitution?	Chemistry Chemical reactions	Hard
136	Which molecule contains a chiral carbon atom?	Chemistry Stereochemistry	Easy
137	Why is a racemic mixture optically inactive?	Chemistry Stereochemistry	Easy
138	What stereochemical result is expected when optically active 2-bromobutane reacts with OH⁻ by the SN2 mechani…	Chemistry Stereochemistry	Medium
139	An optically active tertiary halide undergoes hydrolysis by the SN1 mechanism. What is the main stereochemica…	Chemistry Stereochemistry	Medium
140	How do two enantiomers of 2-bromobutane differ from each other?	Chemistry Stereochemistry	Hard