Q1 · 2000-2022 · 2 marks
The major product obtained upon treatment of compound X with \mathrm{H}_{2} \mathrm{SO}_{4} at 80^{\circ} \mathrm{C} is:
- (a)
- (b)
- (c)
- (d)
Show answer
Answer: (c)
GATE Chemistry (CY) — General Organic Chemistry and Reaction Mechanisms previous year questions
18 questions · 2000 · all with verified answer · last checked 2026-11-10
Q2 · 2000-2022 · 2 marks
In the carbylamine reaction, R-X is converted to R-Y via the intermediate Z. R-X, R-Y and Z, respectively, are
- (a) \mathrm{R}-\mathrm{NH}_{2}, \mathrm{R}-\mathrm{NC}, carbene
- (b) \mathrm{R}-\mathrm{NH}_{2}, \mathrm{R}-\mathrm{NC}, nitrene
- (c) \mathrm{R}-\mathrm{NC}, \mathrm{R}-\mathrm{NH}_{2}, carbene
- (d) \mathrm{R}-\mathrm{OH}, \mathrm{R}-\mathrm{NC}, nitrene
Show answer
Answer: (a)
Q3 · 2000-2022 · 2 marks
The photochemical reaction of 2-methylpropane with \mathrm{F}_{2} gives 2-fluoro-2-methylpropane and 1-fluoro-2-methylpropane in 14:86 ratio. The corresponding ratio of the bromo products in the above reaction using \mathrm{Br}_{2} is most likely to be
- (a) 14:86
- (b) 50:50
- (c) 1:9
- (d) 99:1
Show answer
Answer: (d)
Q4 · 2000-2022 · 2 marks
The major product of the following reaction is 
- (a)
- (b)
- (c)
- (d)
Show answer
Answer: (d)
Q5 · 2000-2022 · 2 marks
In the reaction sequence, 
the structure of the major product Z and the overall yield for its formation from the ketone X , are
the structure of the major product Z and the overall yield for its formation from the ketone X , are - (a)
and 80\% - (b)
and 63 \% - (c)
and 63\% - (d)
and 80\% GATE-2010
Show answer
Answer: (b)
Q6 · 2000-2022 · 2 marks
In the reaction, 
the major product [\mathrm{X}] is:
the major product [\mathrm{X}] is: - (a)
- (b)
- (c)
- (d)
Show answer
Answer: (b)
Q7 · 2000-2022 · 2 marks
The major product formed in the following reaction is
- (a)
- (b)
- (c)
- (d)
GATE-2016
Show answer
Answer: (d)
Q8 · 2000-2022 · 2 marks
The products formed in the following reaction are 
- (a)
- (b)
- (c)
- (d)
Show answer
Answer: (c)
Q9 · 2000-2022 · 2 marks
Reaction of ethyl acetoacetate with one equivalent of methylmagnesium bromide gives
- (a)
- (b)
- (c)
- (d)
GATE 2005
Show answer
Answer: (a)
Q10 · 2000-2022 · 2 marks
Which of the statement is CORRECT about the mechanism of the following reaction? 
- (a) DMSO react with alcohol initially to give , which reacts with (\mathrm{COCl})_{2}.
- (b) (\mathrm{COCl})_{2} reacts with the alcohol initially to give which reacts with DMSO
- (c) DMSO reacts with (\mathrm{COCl})_{2} initially to give , which reacts with the alcohol.
- (d) (\mathrm{COCl})_{2} react with DMSO initially to give which reacts with the alcohol.
Show answer
Answer: (c)
Q11 · 2000-2022 · 2 marks
The reaction, 
- (a)
Birch reduction - (b)
Clemmenson reduction - (c) Wolff-Kishner reduction
- (d) hydride reduction
Show answer
Answer: (a)
Q12 · 2000-2022 · 2 marks
The major product P of the following reactions is 
- (a)
- (b)
- (c)
- (d)
Show answer
Answer: (b)
Q13 · 2000-2022 · 2 marks
In the reaction sequence the major products X and Y, respectively are 
- (a)
and - (b)
and - (c)
and - (d)
and GATE 2010
Show answer
Answer: (c)
Q14 · 2000-2022 · 2 marks
In the following reaction, 
the major product [\mathrm{X}] is:
the major product [\mathrm{X}] is: - (a)
- (b)
- (c)
- (d)
Show answer
Answer: (c)
Q15 · 2000-2022 · 2 marks
The mosjt appropriate sequence of reactions for carrying out the following conversion 
is
is - (a) (i) Peracid; (ii) \mathrm{H}^{+}; (iii) Zn/dil. HCl
- (b) (i) Alkaline \mathrm{KMnO}_{4}; (ii) \mathrm{NaIO}_{4}; (iii) \mathrm{N}_{2} \mathrm{H}_{4} / \mathrm{KOH}
- (c) (i) Alkaline \mathrm{KMnO}_{4}; (ii) \mathrm{H}^{+}; (iii) \mathrm{Zn} / dil. HCl
- (d) (i) \mathrm{O}_{3} / \mathrm{Me}_{2} \mathrm{~S}; (ii) NaOEt ; (iii) \mathrm{N}_{2} \mathrm{H}_{4} / \mathrm{KOH}
Show answer
Answer: (d)
Q16 · 2000-2022 · 2 marks
1(E)-3-bromo-3-hexene when trated with \mathrm{CH}_{3} \mathrm{O}^{-}in \mathrm{CH}_{3} \mathrm{OH} gives
- (a) 3-hexyne
- (b) 2-hexyne
- (c) 2, 3-hexadiene
- (d) 2, 4-hexadiene
Show answer
Answer: (c)
Q17 · 2000-2022 · 2 marks
In the reaction, if the concentration of both the reactants is doubled, then the rate of the reaction will
- (a) remain unchanged
- (b)
quadruple - (c) reduce to one fourth
- (d) double GATE 2009
Show answer
Answer: (d)
Q18 · 2000-2022 · 2 marks
The major product formed in the following reaction is
- (a)
- (b)
- (c)
- (d)
GATE 2020
Show answer
Answer: (b)
Prepare with the GATE batch
Every PYQ is discussed live in the batch. See the course or call +91 92121 42427.
Questions from the ABC Question Bank, typed from the official papers. A question whose answer is still under review is not shown.