General
✓✗In the following Newman projections of n-butane (viewed along C2−C3), the most stable conformation is
- staggered, with the two CH3 groups at 180° (anti)
- eclipsed, with the CH3 groups eclipsing each other
- staggered, with the two CH3 groups at 60° (gauche)
- eclipsed, with each CH3 eclipsing an H atom
General
✓✗Ozonolysis of buta-1,3-diene gives
- propanal and methanal
- two molecules of methanal and one molecule of glyoxal (ethanedial)
- two molecules of ethanal
- only glyoxal
General
✓✗Hydration of but-1-yne (HgSO4/H2SO4) gives
- butanoic acid
- butan-1-ol
- butan-2-one
- butanal
General
✓✗In the chlorination of methane, the initiation step is
- heterolysis of Cl2
- combination of two methyl radicals
- homolysis of Cl2 into two chlorine radicals
- formation of CH3+
General
✓✗The number of different alkenes (counting geometrical isomers separately) formed on dehydrohalogenation of 2-bromobutane with alcoholic KOH is
- 3
- 1
- 4
- 2
General
✓✗According to Hückel’s rule, a planar, cyclic, fully conjugated system is aromatic if it contains
- (2n + 1) π electrons
- 8 π electrons only
- (4n + 2) π electrons
- 4n π electrons
General
✓✗The correct order of reactivity of anisole (I), benzene (II) and nitrobenzene (III) towards an electrophile is
- I = II > III
- I > II > III
- III < I < II
- II > III > I
General
✓✗How many moles of H2 are required to convert one mole of hex-1-en-5-yne completely into hexane?
- 2
- 3
- 4
- 1
General
✓✗Addition of two molecules of HBr to ethyne gives
- 1,1,2,2-tetrabromoethane
- bromoethene only
- 1,1-dibromoethane
- 1,2-dibromoethane
General
✓✗Which statement about but-2-yne is correct?
- It reacts with sodium to liberate H2
- It does not react with ammoniacal AgNO3
- It gives a white precipitate with ammoniacal AgNO3
- It is a terminal alkyne
General
✓✗Which sodium salt on heating with soda lime gives 2-methylpropane?
- Sodium 2-methylpropanoate
- Sodium pentanoate
- Sodium 3-methylbutanoate
- Sodium butanoate
General
✓✗Which of the following alkenes reacts most slowly in electrophilic addition of HBr?
- CH2=CH2
- CH2=CH−NO2
- (CH3)2C=CH2
- CH2=CH−CH3
General
✓✗Which group is an ortho/para director but deactivating?
- −Cl
- −OCH3
- −CH3
- −NH2
General
✓✗Assertion: Lindlar’s catalyst converts alkynes to cis-alkenes.
Reason: Both hydrogen atoms are added from the same side on the catalyst surface (syn addition).
Reason: Both hydrogen atoms are added from the same side on the catalyst surface (syn addition).
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Hydrogenation of benzene with H2 over Ni at high temperature and pressure gives
- cyclohexene
- cyclohexa-1,3-diene
- cyclohexane
- hexane