Chemistry : Organic Chemistry – Some Basic Principles and Techniques

The total number of acyclic structural isomers possible for compound with molecular formula C₄H₁₀O is

• 9

• 7

• 5

• 6

An organic compound A containing nitrogen, on acid catalysed hydrolysis produces a water soluble organic compound B and a gaseous compound C. When methyl magnesium bromide is slowly added to A in 1: 1 ratio and hydrolysed, it produces a compound which can be obtained by dry distillation of the calcium salt of B. The compound A is

• N-methylmethanamide

• N-ethylmethanamide

• acetonitrile

• N, N-dimethylmethanamide

In the estimation of sulphur by Carius method, 0.480 g of an organic compound gives 0.699 g of barium sulphate. The percentage of sulphur in this compound is (Atomic masses Ba = 137, S = 32, O = 16)

• 20%

• 15%

• 35%

• 30%

The least stable free radical is

• CH_{32$\stackrel{.}{\mathrm{C}}$H}

• $\stackrel{.}{\mathrm{C}}$H₃

• (CH₃)₂$\stackrel{.}{\mathrm{C}}$H

• (CH₃)₃$\stackrel{.}{\mathrm{C}}$

Which one of the following reactions proceeds through free radical chain mechanism?

• Addition of HBr on ethene

• Halogenation of benzene in the presence of FeBr₃

• Photochemical chlorination of methane

• Hydrolysis of tert-butyl chloride with aqueous KOH

Which one of the following is the correct statement?

• Achiral molecules are superimposable

• Alanine is optically inactive amino acid

• Glycine is optically active amino acid

• There is inversion when (-)-2-methylbutan-1-ol is heated with conc. HCl to form (+)-1-chloro-2-methylbutane

When HBr adds on hex-1-ene in the presence of benzoyl peroxide, the product is

• 2-bromohexane

• 2, 3-dibromohexane

• 1-bromohexane

• 2, 4-dibromohexane

The decreasing order of boiling points of alkyl halides is

• RF > RCl > RBr > RI

• RBr > RCl > RI > RF

• RI > RBr > RCl > RF

• RCl > RF > RI > RBr

The correct order of ease of cleavage of ether linkage by hydrogen halide follows

• HI > HBr > HCl

• HBr > HI > HCl

• HCl > HBr > HI

• HCl > HI > HBr

What are the starting materials to get 2-methylpropene as the major product?

• Sodium methoxide and sec-butyl bromide

• Sodium ethoxide and sec-butyl bromide

• Sodium tert-butoxide and ethyl bromide

• Sodium methoxide and tert-butyl bromide