Among the carboxylic acid shown below, the ones that exhibit stereoisomerism and also form, cyclic anhydrides on heating are3 )CH2 CH2 COOH3 H7 )COOH2 H5 )CH2 COOH3 )(C2 H5 )COOH
A. I and II
B. I and III
C. II and III
D. II and IV
Select an option to see the answer and solution.
Match the following compounds with their respective classes
A. I:steroid; II:terpenoid; III:alkaloid; IV:DNA base
B. I:terpenoid; II:steroid; III:alkaloid; IV:DNA base
C. I:terpenoid; II:steroid; III:DNA base; IV:alkaloid
D. I:steroid; II:terpenoid; III:DNA base; IV:alkaloid
Select an option to see the answer and solution.
The sequence of an mRNA molecule produced from a DNA template strand with the composition 5'-AGCTACACT-3' is
A. 5'-AGUGUAGCU-3'
B. 5'-UCGAUGUGA-3'
C. 5'-AGTGTAGCT-3'
D. 5'-TCGATGTGA-3'
Select an option to see the answer and solution.
Pyrrole + PhMgBr → E + F
E + MeCl → G + H
F + MeCl → no reaction without a catalyst
The structure of products E - H respectively are
A. 3, 2, 6, 7
B. 4, 5, 6, 1
C. 3, 4, 5, 2
D. 3, 2, 4, 5
Select an option to see the answer and solution.
The mono protonation of adenine (X) in acidic solution mainly occurs at
A. position 1
B. position 2
C. position 3
D. position 4 or 5
Select an option to see the answer and solution.
The molecules(s) that exist as meso structure (s)
is/are
A. only M
B. both K and L
C. only L
D. only K
Select an option to see the answer and solution.
Three molecular ionic states, P-R are possible for the amino acid histidine. Identify the correct choice of pH values, respectively for the observation of the ionic states P-R.
A. P at pH 1; Q at pH 12; R at pH 7
B. P at pH 7; Q at pH 1; R at pH 12
C. P at pH 12; Q at pH 7; R at pH 1
D. P at pH 12; Q at pH 1; R at pH 7
Select an option to see the answer and solution.
In allene, hybridization of the central and terminal carbons respectively, are
A. sp2 and sp2
B. sp2 and sp3
C. sp and sp2
D. sp and sp3
Select an option to see the answer and solution.
Benzene cannot be iodinated with I 2 3 , iodination is possible. The electrophiles formed in the case is
A. [ I + ]
B. [ I − ]
C. [ I + δ ... O + δ H 2 ] +
D. [ I + δ ... O − δ H 2 ] +
Select an option to see the answer and solution.
In electrophilic aromatic substitution reactions, nitro group is meta-directing because the nitro group
A. increases electron density at meta-position
B. increases electron density at ortho and para-positions
C. decreases electron density at meta-position
D. decreases electron density at ortho and para-positions
Select an option to see the answer and solution.
The major product formed in the reaction of anisole with lithium, liquid ammonia and t-butanol is
A. 1-methoxycyclohexa-1, 4-diene
B. 2-methoxycyclohexa-1, 3-diene
C. 1-methoxycyclohexa-1, 3-diene
D. 3-methoxycyclohexa-1, 4-diene
Select an option to see the answer and solution.
The number of signals that appear in the broad-band decoupled 13 C NMR spectrum of ortho, meta and para-dichlorobenzene, respectively are
A. 3, 4 and 2
B. 3, 3 and 2
C. 4, 4 and 2
D. 3, 4 and 4
Select an option to see the answer and solution.
The configurations at the two asymmetric centres (C-1 and C-6) in the bicyclo [4.4.0] decane, given below are
A. 1R, 6R
B. 1R, 6S
C. 1S, 6S
D. None of the above
Select an option to see the answer and solution.
In the reaction,
if the concentration of both the reagents is doubled then the rate of the reaction will
A. remain unchanged
B. quadruple
C. reduce to one fourth
D. double
Select an option to see the answer and solution.
Cyclohexyl benzyl ether when reacted with hydrogen in the presence of 10% palladium on charcoal generates a mixture of
A. cyclohexanol and benzyl alcohol
B. cyclohexane and benzyl alcohol
C. cyclohexanol and toluene
D. cyclohexane and toluene
Select an option to see the answer and solution.
Optically active 2-octanol rapidly loses its optical activity when exposed to
A. dilute acid
B. base
C. light
D. humidity
Select an option to see the answer and solution.
Benzaldehyde can be prepared by reacting phenyl magnesium bromide with
A. N, N-dimethylformamide
B. carbon dioxide
C. formaldehyde
D. ethyl chloroformate
Select an option to see the answer and solution.
The increasing order of basicity among the following is
A. Y < X < Z
B. Y < Z < X
C. X < Z < Y
D. X < Y < Z
Select an option to see the answer and solution.
The major product (X) of the monobromination reaction is
Select an option to see the answer and solution.
Proton decoupled 13 C NMR spectrum of a bicyclooctane (C8 H14 ), exhibits only two signals. The structure of the compound is
Select an option to see the answer and solution.
