Recent questions tagged basic-organic-chemistry

The kind of delocalization involving sigma bond orbitals is called,

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Compounds containing which of the following functional groups can exhibit geometrical isomerism

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Polarization of electrons in acrolein may be written,

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Which of the following compounds exhibits stereo isomerism

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How many structural (including stereoisomers ) isomers could be obtained by replacing one hydrogen of propene with chlorine ?

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How many chiral carbon atoms are present in $2,3,4$ trichloropentane ?

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The number of optical isomers formed hydrogenation of the compound, $(CH_3)_2C = CHCH_3$ are :

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The structure of $H_2C = C = CH_2$ is /has

asked Mar 3, 2014 by meena.p

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Absolute alcohol is prepared by

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An organic molecule necessarily shows optical activity if it

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Which of the following compounds will exhibit geometrical isomerism ?

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One among the following pairs of compounds is not isomers:

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Refer the below diagram :

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The formation of cyanohydrin from a ketone is an example of

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Optical isomerism arises from the presence of

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How many optical isomers are possible for the compound abdc - cabd?

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Which of the following correctly represents the $+I$ effect of the substituents :

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Inductive effect involves

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In the reaction : $ CH_3CHO +HCN \longrightarrow CH_3CH(OH)CN$ a chiral centre is produced . This product would be :

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Which one of the following does not have $SP^2$ hybridized carbon ?

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Which of the following is most stable

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A compound with empirical formula $CH_2O$ has a vapour density of 30. Its molecular formula is

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Which of the following is least reactive in a nucleophilic substitution reaction ?

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$CH_3Br +Nu^{-} \longrightarrow CH_3 -Nu +Br^{-} $ The decreasing order of the rate of the above reaction with nucleophiles $(NU)$ A to D is $[Nu^{-}=\quad (A)\; Pho^{-},\;(B)\;AcO^- ,\; (C)\; HO^{-},\; (D)\;CH_3O^{-}]$

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Which of the following compounds does not show lassaigne's test for nitrogen ?

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The enolic form of acetone contains

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For which of the following parameters the structural isomers $C_2H_5OH$ and $CH_3OCH_3$ would be expected to have the same values ? (Assume ideal behaviour )

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An enantiometrically pure acid is treated with racemix mixture of an alcohol having carbon. The ester formed will be :

asked Feb 28, 2014 by meena.p

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$CH_3,NH_2,OH$ and $F$ in increasing $pk_b $ values are :

asked Feb 28, 2014 by meena.p

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What is the decreasing order of strength of the bases. $OH^{-}.NH_2^{-}.HC \equiv C^{-}$ and $CH_3 -CH_2^{-} $?

asked Feb 28, 2014 by meena.p

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$CH_2 =CH CH_2CH =CH_2 \longrightarrow A,\;A $ is ?

asked Feb 28, 2014 by meena.p

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Br has a low reactivity in $CH_2 =CH-Br$ because (i) of -M effect of bromine (ii) of more electro negativity of bromine (iii) of partial double bond character between $C-Br $ bond. (iv) of the +M effect of bromine.

asked Feb 28, 2014 by meena.p

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Hydrolysis of neopentyl bromide under $SN_1$ process results into

asked Feb 28, 2014 by meena.p

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Which of the following is purified by vacuum distillation ? (i) Glycerine (ii) Glycerol (iii) propane 1,2,3- triol (iv) Ethanol

asked Feb 28, 2014 by meena.p

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Isomers which can not be interconverted through rotation around a single bond are : (i) Conformers ; (ii) diastereomers ; (iii) Enantiomers ; (iv) Positional isomers;

asked Feb 28, 2014 by meena.p

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The cannizzaro reaction of benzaldehyde and formaldehyde in the presence of $NaOH$ gives, $(i)\;C_6H_5CH_2OH\; ;(ii)\; C_6H_5COONa\; ; (iii)\; HCOONa \; ; (iv) \;CH_3OH$

asked Feb 28, 2014 by meena.p

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Which of the following compounds will have only primary and tertiary carbon? (i) Pentane (ii) 2- Methylbutane (iii) 2,3 -Dimethylbutane (iv) 2- Bromo-2-Methylpropane

asked Feb 28, 2014 by meena.p

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Which of the following have zero dipole moment ? $(i)\; H_2;\; (ii)\;HF;\; (iii)\; CH_4; \; (iv) CHCl_3$

asked Feb 28, 2014 by meena.p

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Which of the following statements are correct ?

asked Feb 28, 2014 by meena.p

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The statement which are correct regarding benzene are : (i) It has $12 \sigma$ and $3 \pi$ bonds. (ii) There is delocalisation of $\pi$ - electrons. (c) $C-C$ bond distance is $1.39 A^{\circ}$ . (d) $C-C$ bond distance is $1.39 A^{\circ}$ and $1.54\;A^{\circ}$ alternatively .

asked Feb 28, 2014 by meena.p

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Which of the following compounds are chiral and resolvable ? $(i) \;[C_6 H_5 N^+(CH_2CH_2CH_3)(C_2H_5)(CH_3)]Br^ - ; \; (ii) C_6H_5N(CH_3)(C_2H_5) ; \\ (iii)\; CH_3CH_2CH (CH_3) (C_2H_5);\; (iv)\; HO_2C- CO_2H$

asked Feb 28, 2014 by meena.p

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Which of the following will undergo a connizzara reaction ?

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In the reaction

asked Feb 28, 2014 by meena.p

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Which of the following groups are the following groups are ortho, para directing ? $ \\ (i) -NH_2 \quad\quad\quad (ii)\; -N-C -CH_3 \quad\quad\quad (iii)\;-CN \quad\quad\quad(iv)\; -SO_3H$

asked Feb 28, 2014 by meena.p

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Which of the following statement are true for the organoborance ? (i) It can be thermally rearranged (ii) It can be oxidised to 3-pentanol (iii) It can be converted to pentane (iv) None of these.

asked Feb 28, 2014 by meena.p

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Kjeldahl's method cannot be used for estimation of nitrogen in $(i)\; C_6H_5NO_2 ;\; (ii)\;Pyridine; \;(iii)\;C_6H_5 - N = N -C_6H_5 ;\;(iv)\;C_6H_5NHCOCH_3 $

asked Feb 28, 2014 by meena.p

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The molecules that will have dipole moments are : (i) 2,2 Dimethyl propane (ii) trans-2-pentene (iii) cis - 3 - Hexene (d) 2,2,3,3 -Tetramethyl butane

asked Feb 27, 2014 by meena.p

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When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound.An optically active hydrocarbon $(A) C_6H_{10}$ on catalytic reduction gives optically inactive hydrocarbon . structure of $(A )$ is

asked Feb 27, 2014 by meena.p

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When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound. IUPAC name for lowest molecular mas optically active alkene is

asked Feb 27, 2014 by meena.p

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When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound. Lowest molecular mass optically active ketone contians ____ carbon atoms?

asked Feb 27, 2014 by meena.p

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