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26701.

The number of p-disubstituted benzene derivations of C_(9)H_(13)N is

Answer»


SOLUTION :
Discussion
26702.

The order of reactivity of following alcohols with halogen acids is _____ (A). CH_(3)CH_(2)-CH_(2)-OH (B). CH_(3)CH_(2)-underset(CH_(3))underset(|)(C)H-OH (C). CH_(3)CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OH

Answer»

AgtBgtC
CgtBgtA
BgtAgtC
AgtCgtB

Solution :The REACTIVITY of alcohols towards hologen acids DECREASES in the order: `3^(@) gt 2^(@) gt 1^(@)`, i.e., (C)gt(B)gt(A).
Discussion
26703.

The number of p-electrons in bromine atom is:

Answer»

17
7
15
12

Answer :A
Discussion
26704.

The order of reactivity of following alcohols with halogen acids is ……… (A) CH_(3)CH_(2)-CH_(2)-OH(B)CH_(3)CH_(2)-underset(CH_(3))underset("|")("C ")H-OH(C ) CH_(3)CH_(2)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C")-OH

Answer»

`(A)gt (B)gt (C )`
`(C )gt (B)gt (A)`
`(B)gt (A)gt (C )`
`(A)gt (C )gt (B)`

SOLUTION :The reaction of HALOGEN acids with alcohol procceeds through carbocation intermediate. Greater stability of Carbocation, FASTER is the reaction. The stability order is `3^(@)gt 2^(@)gt 1^(@)`.
Discussion
26705.

The number of oxygen atoms surrounding each chlorine atom in Cl_(2)O_(7) compound

Answer»


Solution : In `Cl_(2) O_(7)` each CHLORINE in SURROUNDED by four OXYGEN atoms
Discussion
26706.

The order of reactivity of following alkyl halide in SN^(2) reaction is

Answer»

`R-I GT R-Br gt R-Cl gt R-F`
`R-F gt R-Cl gt R-Br gt R-I`
`R-I gt R-CI gt R-Br gt R-F`
`R-I gt R-F gt R-Br gt R-CI`

ANSWER :A
Discussion
26707.

The order of reactivity of different halogens with alkanes for halogenation is s

Answer»

`F_(2)gtCl_(2)gtBr_(2)gtI_(2)`
`F_(2)gtBr_(2)gtC_(2)gtI_(2)`
`F_(2)gtCl_(2)gtI_(2)gtBr_(2)`
`F_(2)gtI_(2)gtBrgtCl_(2)`

ANSWER :A
Discussion
26708.

The number of oxygen atoms present in 14*6 g of magnesium bicarbonate is

Answer»

`6N_(0)`
`0*6N_(0)`
`N_(0)`
`N_(0)//2`

Solution :Magnesium bicarbonate is `MG(HC)_(3))_(2)` 146 g of `Mg((HCO_(3))_(2)` contains O ATOMS = `6N_(0)`
`:. 14*6 g` of `Mg(HCO_(3))_(2)` contains O ATOM
`=0*6 N_(0)`
Discussion
26709.

The order of reactivity of fo llowing alcohols towards HCl is, 1.CH_3OH, 2.CH_3CH_2CH_2OH , 3.(CH_3)_2CHOH , 4.(CH_3)_3COH

Answer»

1 gt 2gt 3gt 4
4 gt 3 gt 2 GT1
3 gt 4 gt 2 gt 1
2 gt 4 gt 1 gt 3

Answer :B
Discussion
26710.

The order of reactivity of different halogens towards halogenation of alkanes follows the sequence

Answer»

`F_2 GT Cl_2 gt Br_2 gt I_2`
`Br_2 gt Cl_2 gt F_2 gt I_2`
`I_2 gt Br_2 gt Cl_2 gt F_2`
`Cl_2 gt F_2 gt I_2 gt Br_2`

ANSWER :A
Discussion
26711.

The number of Oxygen atoms present around Nitrogen in N_(2)O_(5) is

Answer»

2
1
3
4

Answer :3
Discussion
26712.

The order of reactivity of CH_(3)CHO, CH_(3)COC_(2)H_(5) and CH_(3)COCH_(3)is

Answer»

`CH_(3)CHO gt CH_(3)COCH_(3) gt CH_(3)COC_(2)H_(5)`
`C_(2)H_(5)COCH_(3) gtCH_(3)COCH_(3) gt CH_(3)CHO`
`CH_(3)COCH_(3) gt CH_(3)CHO gt C_(2)H_(2)COCH_(3)`
`CH_(3)COCH_(3) gt C_(2)H_(5)COCH_(3) gt CH_(3)CHO`

Solution :Aldehydes are more reactive than ketones.
Discussion
26713.

The order of reactivity of carboxylic acid derivatives is ________

Answer»

Acid chloride `GT` ESTER `gt` AMIDE `gt` Acid anhydride
Acid chloride `gt` Acid anhydride `gt` Ester `gt` Amide
Acid chloride `gt` Amide `gt` Acid anhydride `gt` Ester
Acid anhydride `gt` Ester `gt` Amide `gt` Acid chloride

Answer :B
Discussion
26714.

The order of reactivity of alkyl halides with ammonia is in the order :

Answer»

`RI GT RBR gt RCl`
`RI gt RCI gt RBr`
`RCl gt RBr gt RI`
`RBr gt RCl gt RI`

Answer :A
Discussion
26715.

The order of reactivity of alkenes , underset"(I)"((CH_3)_2C)=CH_2,underset"(II)"(CH_3CH)=CH_2,underset"(III)"(CH_2=CH_2)when subjected to acid catalyzed hydration is

Answer»

`I GT II gtIII`
`I gt III gt II`
`III gt II gt I`
`II gt I gt III`

ANSWER :A
Discussion
26716.

The order of reactivity in nucleophilic substitution reaction is

Answer»

`CH_(3)F LT CH_(3)Cl lt CH_(3)I lt CH_(3)BR`
`CH_(3)F lt CH_(3)Cl lt CH_(3)Br lt CH_(3)I`
`CH_(3)F lt CH_(3)Br lt CH_(3)Cl lt CH_(3)I`
`CH_(3)I lt CH_(3)Br lt CH_(3)Cl lt CH_(3)F`

ANSWER :B::C
Discussion
26717.

The number of oxygen atoms in 4.4 g of CO_(2) is approx

Answer»

`1.2xx10^(23)`
`6xx10^(22)`
`6xx10^(23)`
`12xx10^(23)`

Solution :44 G of `CO_(2)` has `2xx6xx10^(23)` atoms of OXYGEN
4.4 g of `CO_(2)` has `=(12xx10^(23))/44 xx4.4=1.2xx10^(23)` atoms.
Discussion
26718.

The number of oxygen atoms in 4.4g of CO_(2) is

Answer»

`1.2xx10^(23)`
`6xx10^(22)`
`6xx10^(23)`
`12XX10^(23)`

Solution :44 g of `CO_(2)" CONTAIN" = 6.023xx10^(23)`molecules of `CO_(2)`
4.4g of `CO_(2)` will contain = `6.023xx10^(23)/(44)xx4.44`
`=6.023xx10^(22)` molecules of `CO_(2)~
`1molecule of `CO_(2)` contains two oxygen ATOMS
`6.023xx91^(22)` molecules of `CO_(2)` will contain
`2xx6.023xx10^(22)=1.210^(23)`oxygen atoms
Discussion
26719.

The order of reactivities of the following alkyl halides for a S_N2 reaction is

Answer»

` RF GT RCl gt RBR gt Rl`
` RF gt RBr gt RCl gt RI `
` RCl gt RBr gt RF gt RI`
` RI gt RBr gt Rcl gt RF`

Answer :D
Discussion
26720.

The number of oxgyens that undergo tautomeristion acid reaction.

Answer»


ANSWER :1
Discussion
26721.

The number of oxygen atom in paracetamol is …..

Answer»


SOLUTION :.
Discussion
26722.

The order of reactivities of the following alkyl halides for a S_(N^(2)) reaction is :

Answer»

a. RF > RCI > RBr > RI
b. RF > RBr > RCI > RI
c. RCI > RBr > RF > RI
d. RI > RBr > RCI > RF

ANSWER :D
Discussion
26723.

The order of reactivety of the following alcohols towards conc. HCl is :

Answer»

I gt II gt III gt IV
I gt III gt II gtIV
IV gt III gt II gt I
IV gt III gt I gt II

Solution :N//A
Discussion
26724.

The number of orbitals in n=4 is

Answer»

2
8
16
32

Solution :No of ORBITALS in a SHELLS `=N^(2)=16`
Discussion
26725.

The order of reactivities of the following alky halide for a SN^2 reaction is :

Answer»

`RF GT RCI gt RBR gt RI`
`RF gt RBr gt RCl gt RI`
`RCl gt RBr gt RI`
`RI gt RBr gt RCl gt RF`

Answer :D
Discussion
26726.

The number of orbitals in n=3 are

Answer»

1
4
9
16

Answer :C
Discussion
26727.

The order of reactivities of the following alkyl halides for a S_(N)2 reaction is :

Answer»

`RFgtRCIgtRBrgtRI`
`RFgtRBrgtRCIgtRI`
`RClgtRBrgtRFgtRI`
`RIgtRBrgtRClgtRF`

ANSWER :D
Discussion
26728.

The number of optically inactive stereoisomers possible for tartaric acid.

Answer»


SOLUTION :
Discussion
26729.

The number of optically active isomers of the compound C_(7)H_(16) are :

Answer»

TWO
four
five
six

Answer :A
Discussion
26730.

The order of reactivities of methyl halides in the formation of Grignard reagent is:-

Answer»

`CH_(3)I gtCH_(3)Br gt CH_(3)CL`
`CH_(3)Cl gt CH_(3)Br gt CH_(3)I`
`CH_(3)Br gt CH_(3)Cl gt CH_(3)I`
`CH_(3)Br gt CH_(3)IgtCH_(3)Cl`

SOLUTION :Reactivity towards GRIGNARD REAGENT are as under `CH_(3)I gt CH_(3)Br gt CH_(3)Cl`
Discussion
26731.

The number of optically active compounds in the isomers of C_(4) H_(9)Br is

Answer»

1
2
3
4

Answer :B
Discussion
26732.

The order of reactivities of the following alkyl halides for a S_N^2 reactions is:

Answer»

`RF gt RCI gt RBr gt RI`
`RF gt RBr gt RCL gt RI`
`RCl gt RBr gt RI`
`RI gt RBr gt RCl gt RF`

Answer :D
Discussion
26733.

The number of optical isomers of the compound CH_(3)CHBrCOOH is :

Answer»

0
1
3
4

Answer :D
Discussion
26734.

The order of reactivities of acyl compounds towards nucleophilic substitution

Answer»

ACID ANHYDRIDE gt Amide gt ESTER gt ACYL chloride
Acyl chloride gt Ester gt Acid anhydride gt Amide
Acyl chloride gt Acid anhydride gt Ester gt Amide
Ester gt Acyl chloride gt Amide gt Acid anhydride

Answer :C
Discussion
26735.

The order of reactivities of methyl halides in the formation of Grignard reagent is

Answer»

`CH_(3)IgtCH_(3)BR gt CH_(3)CL`
`CH_(3)Cl gt CH_(3)Br gt CH_(3)L`
`CH_(3)Br gt CH_(3)Cl gt CH_(3)l`
`CH_(3)Br gt CH_(3)l gt CH_(3)Cl`.

Solution :`CH_(3)I gt CH_(30Br gt CH_(3)Cl`
Discussion
26736.

The order of reaction A to product can be given by the expression (s) [where r=rate of reaction, [A]_(1)= concentration at tiem t_(1),[A]_(2)= concentration at time t_(2)

Answer»

`(lnr_(2)-lnr_(1))/(LN[A]_(1))`
`(ln[A_(0)]_(2)-ln[A_(0)]_(1))/(ln[t_(1//2)]_(2)-ln[t_(1//2)]_(1))`
`(ln(-d[A]/k'dt))/(ln[A])`
`(ln(r/k))/(ln[A])`

Answer :A::C::D
Discussion
26737.

The number of optical isomers of the compound, CH_(3)-underset(Br)underset(|)(CH)-underset(Br)underset(|)(CH)-COOH is :

Answer»

0
1
3
4

Solution :According to van't Hoff's equation, no. of option ISOMERS `=2^(n)` (when the molecule has no SYMMETRY).
where, n = no. of chiral carbon ATOMS.
`CH_(3) - overset(**)(C )HBR- overset(**)(C )HBr - COOH`
No of chiral carbons=2
`:.` No. of OPTICAL isomers are `=2^(n) = 2^(2) =4`
Discussion
26738.

The number of optical isomers of the compound. CH_(3)-CHBr-CHBr-COOH is:

Answer»

0
1
3
4

Answer :D
Discussion
26739.

The order of rate of hydrolysis of alkyl halides 1^(@),2^(@),3^(@) and CH_(3)X by the S_(N)2 pathway is

Answer»

`1^(@) gt 2^(@) gt 3^(@)gtCH_(3)X`
`CH_(3)X gt 3^(@) gt 2^(@) gt 1^(@)`
`CH_(3)X gt 1^(@) gt 2^(@) gt 3^(@)`
`3^(@) gt 2^(@) gt 1^(@)gtCH_(3)X`

Solution :Reactivity DECREASES as steric hindrance increases, i.e., `CH_(3)X gt 1^(@) gt 2^(@) gt 3^(@)`.
Discussion
26740.

The number of optical isomers for the compound, CH_(3)-CH(Br)-CH(Br)C_(2)H_(5) is

Answer»

1
2
4
3

Solution :The compound `CH_(3)-CH(Br)CH(Br)C_(2)H_(5)` cannot be divided into two identical HALVES. It has 2 chiral CENTRES. The formula for number of optically active form is `2^(n)`. Where n is the number of chiral centres.
Hence `2^(2) = 4`
Hence the number of isomers are 4 so choice (a), (b) and (d) are INCORRECT while (C) is correct.
Discussion
26741.

The order of reaction can be deduced from

Answer»

CHEMICAL equation
Experiments
Rate constant
Thermochemical equation

Answer :B
Discussion
26742.

The order of polarity of CH_(3)I, CH_(3)Br and CH_(3)Cl molecules follows the order

Answer»

`CH_(3)Br gt CH_(3)CL gt CH_(3)I`
`CH_(3)I gt CH_(3)Br gt CH_(3)Cl`
`CH_(3)Cl gt CH_(3)Br gt CH_(3)I`
`CH_(3)Cl gt CH_(3)I gt CH_(3)Br`

Solution :SINCE the ELECTRONEGATIVITY follows the order `Cl gt Br gt I`, the order of polarity is `CH_(3)Cl gt CH_(3)Br gt CH_(3)I`.
Discussion
26743.

The number of optical isomers of an organic compound having n asymmetric carbon atoms will be

Answer»

`2^(N+1)`
`n^(2)`
`2^(n)`
`2^(n-1)`

Solution :`2^(n)`, n = no. of ASYMMETRIC CARBON atoms.
Discussion
26744.

The order of polarity of CH_3I CH_3Br and CH_3Cl molecules follow the order:

Answer»

`CH_3Br GT CH_3Cl gt CH_3I`
`CH_3I gt CH_3Br gt CH_3Cl`
`CH_3Cl gt CH_3Br gt CH_3I`
`CH_3Cl gt CH_3I gt CH_3Br`

ANSWER :C
Discussion
26745.

The number of optical isomers of CH_3CH(OH)CH(OH)CHO is :-

Answer»

`3`
`4`
`5`
`6`

ANSWER :B
Discussion
26746.

The order of oxidation ability

Answer»

`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)`<BR>`Cl_(2) gt F_(2) gt Br_(2)gt I_(2)`
`F_(2) gt Cl_(2) = Br_(2) gt I_(2)`
`Br_(2) gt Cl_(2) gt F_(2) gt I_(2)`

SOLUTION :Oxidation ability decrease from `F_(2)`to `I_(2)` . ELECTRON affinity of HALOGENS is hgh. Fluorine is the best oxidising agent.
Discussion
26747.

The number of optical isomers for acompound having two similar asymmetric carbon atoms in the molecule is given as

Answer»

2
`2^(2)`
` GT 2^(2)`
` LT 2^(2)`

ANSWER :D
Discussion
26748.

The number of optical isomers depend on __________.

Answer»

NUMBER of CHIRAL carbon
number of carbon present
number of oxygen present
both (B) and (c)

Solution :number of chiral carbon
Discussion
26749.

The order of melting point of ortho, para, meta-nitrophenol is

Answer»

<P>`o GT m gt p`
`p gt m gt o`
`m gt p gt o`
`p gt o gt m`

ANSWER :B
Discussion
26750.

The number of optical enantiomrs of tartaric acid:

Answer»

3
2
4
1

Answer :B
Discussion