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Quiz 231
Mdcat-past-papers Quiz
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4601. Value of electronegativity of atoms A and B are 1.20 and 4.0 respectively, the percent ionic character will be:
43%
50%
55%
73%
4602. Phenol differs from ethanol because it:
Forms stronger hydrogen bonds to its aromatic ring
Is more acidic because of resonance stabilized conjugate base
Readily undergoes nucleophilic substitution at the -OH group
Is completely insoluble in water due to its benzene ring
4603. Which reagent and condition are used to bring about the reaction shown? Toluene → p-chloro toluene
Cl₂ in the dark
Cl₂ in the presence of AlCl₃
Cl₂ in the presence of UV light
Concentrated HCl heated under reflux
4604. What is 50% yield when actual yield and theoretical yield are 2 g and 4 g respectively?
25%
50%
75%
85%
4605. IUPAC name of CHCCI is:
Chloroethane
Chloroethyne
Chloroethene
Ethylchloride
4606. The order of reactivity of following R-X for SX reaction is:
RF>RCl>RBr>RI
RBr>RF>RCl>RI
RCl>RF>RBr>RI
RI>RBr>RCl>RF
4607. Among the following compounds, the most susceptible to nucleophilic attack on carbonyl carbon is:
CH3COCl
CH3CHO
CH3COOCH₃
CH3COOCOCH₃
4608. Which of the following is expected to be the most paramagnetic?
Li
Be
B
C
4609. The formation of activated complex in a reaction is:
Exothermic process
Endothermic process
Either endo or exo
Always energy released
4610. The maximum probability of finding an electron is at a distance of:
0.53 nm
0.35 nm
0.053 nm
0.0053 nm
4611. The IUPAC name of Vinyl acetylene is:
But-1-en-3-yne
But-3-en-1-yne
Pent-3-en-1-yne
Pent-2-en-4-yne
4612. Which atom has at least single electron in dumbell shape orbital?
H
He
Li
B
4613. Which of following adhesive is used to bond broken pieces of jewelry?
Super glue
Epoxy resin
Silicon resin
Starch
4614. Ratio of sigma bonds and pi bonds present in benzene are:
4:1
1:4
2:3
6:1
4615. Which one is addition polymer?
polyvinyl chloride
nylon 6,6
nylon 6,10
polyester
4616. When one mole of a substance is decomposed preferably as compared to evaporation then decomposition has:
Low energy
High energy
Equal energy
Cannot predicted
4617. At start of reaction:
Average rate is high
Instantaneous rate is high
Both rates are same
Both rates are slow
4618. Which is not true about benzene:
Sp² hybridization
Fractional bond order
No elimination reaction
6 sites for monosubstitution
4619. During Clemmenson reduction of aldehyde and ketone, carbonyl group into alkane group is carried out with:
H₂ and Pd
LiAlH₄
Zn/Hg conc.HCl
NH₂-NH₂/KOH
4620. Consider the given reaction: N2+3H2→2NH3. If 56 g of N2 reacts with 12 g of H2 and produces 51 g of NH3, what is the theoretical yield (TY) of NH3 and the percentage yield (PY) of the reaction? (Molar mass of N2 = 28 g/mol, H2 = 2 g/mol and NH3 = 17 g/mol)
TY = 68 g and PY = 75%
TY = 34 g and PY = 67%
TY = 68 g and PY = 33%
TY = 34 g and PY = 75%
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