jee-advanced 2012 Q36

jee-advanced · India · paper1 Not Maths

36. The substituents $\mathbf { R } _ { \mathbf { 1 } }$ and $\mathbf { R } _ { \mathbf { 2 } }$ for nine peptides are listed in the table given below. How many of these peptides are positively charged at $\mathrm { pH } = 7.0$ ? [Figure]

Peptide	$\mathbf { R } _ { \mathbf { 1 } }$	$\mathbf { R } _ { \mathbf { 2 } }$
1	H	H
II	H	$\mathrm { CH } _ { 3 }$
III	$\mathrm { CH } _ { 2 } \mathrm { COOH }$	H
IV	$\mathrm { CH } _ { 2 } \mathrm { CONH } _ { 2 }$	$\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$
V	$\mathrm { CH } _ { 2 } \mathrm { CONH } _ { 2 }$	$\mathrm { CH } _ { 2 } \mathrm { CONH } _ { 2 }$
VI	$\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$	$\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$
VII	$\mathrm { CH } _ { 2 } \mathrm { COOH }$	$\mathrm { CH } _ { 2 } \mathrm { CONH } _ { 2 }$
VIII	$\mathrm { CH } _ { 2 } \mathrm { OH }$	$\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$
IX	$\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$	$\mathrm { CH } _ { 3 }$

ANSWER : 4

$29.2 \% ( \mathrm { w } / \mathrm { w } ) \mathrm { HCl }$ stock solution has density of $1.25 \mathrm {~g} \mathrm {~mL} ^ { - 1 }$. The molecular weight of HCl is $36.5 \mathrm {~g} \mathrm {~mol} ^ { - 1 }$. The volume ( mL ) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is

36. The substituents $\mathbf { R } _ { \mathbf { 1 } }$ and $\mathbf { R } _ { \mathbf { 2 } }$ for nine peptides are listed in the table given below. How many of these peptides are positively charged at $\mathrm { pH } = 7.0$ ?\\
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\begin{center}
\begin{tabular}{|l|l|l|}
\hline
Peptide & $\mathbf { R } _ { \mathbf { 1 } }$ & $\mathbf { R } _ { \mathbf { 2 } }$ \\
\hline
1 & H & H \\
\hline
II & H & $\mathrm { CH } _ { 3 }$ \\
\hline
III & $\mathrm { CH } _ { 2 } \mathrm { COOH }$ & H \\
\hline
IV & $\mathrm { CH } _ { 2 } \mathrm { CONH } _ { 2 }$ & $\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$ \\
\hline
V & $\mathrm { CH } _ { 2 } \mathrm { CONH } _ { 2 }$ & $\mathrm { CH } _ { 2 } \mathrm { CONH } _ { 2 }$ \\
\hline
VI & $\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$ & $\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$ \\
\hline
VII & $\mathrm { CH } _ { 2 } \mathrm { COOH }$ & $\mathrm { CH } _ { 2 } \mathrm { CONH } _ { 2 }$ \\
\hline
VIII & $\mathrm { CH } _ { 2 } \mathrm { OH }$ & $\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$ \\
\hline
IX & $\left( \mathrm { CH } _ { 2 } \right) _ { 4 } \mathrm { NH } _ { 2 }$ & $\mathrm { CH } _ { 3 }$ \\
\hline
\end{tabular}
\end{center}

ANSWER : 4\\

Paper Questions

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