Boron and its Compounds
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CHXI11:THE P-BLOCK ELEMENTS

316091 All the products formed in the oxidation of \(\mathrm{NaBH}_{4}\) by \(\mathrm{I}_{2}\) are

1 \(\mathrm{B}_{2} \mathrm{H}_{6}+\mathrm{NaI}\)
2 \({{\rm{B}}_{\rm{2}}}{{\rm{H}}_{\rm{6}}}{\rm{,}}{{\rm{H}}_{\rm{2}}}\,{\rm{and}}\,{\rm{NaI}}\)
3 \(\mathrm{BI}_{3}\) and \(\mathrm{NaH}\)
4 \(\mathrm{NaBI}_{4}\) and \(\mathrm{HI}\).
CHXI11:THE P-BLOCK ELEMENTS

316092 Which of the following statements is correct in the context of diborane \(\left(\mathrm{B}_{2} \mathrm{H}_{6}\right)\) ?

1 There are 12 valence electrons-three from each of the two boron atoms and six from the six hydrogen atoms
2 Two of the six hydrogen atoms form two bridges between two boron atoms
3 The two bridging hydrogen atoms are in a plane perpendicular to the rest of the molecule and prevent rotation between the two boron atoms
4 All of these
CHXI11:THE P-BLOCK ELEMENTS

316093 An alkali metal hydride \((\mathrm{NaH})\) reacts with diborane in ' \({\text{A}}\) ' to give a tetrahedral compound ' \({\text{B}}\) ' which is extensively used as reducing agent in organic synthesis. The compound ' \({\text{A}}\) ' and ' \({\text{B}}\) ' respectively are

1 \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) and \(\mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
2 \(\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{O}\) and \(\mathrm{NaBH}_{4}\)
3 \(\mathrm{C}_{2} \mathrm{H}_{6}\) and \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Na}\)
4 \(\mathrm{C}_{6} \mathrm{H}_{6}\) and \(\mathrm{NaBH}_{4}\)
KCET - 2015
CHXI11:THE P-BLOCK ELEMENTS

316094 Consider the following statements for diborane:
I. Boron is approximately \(\mathrm{sp}^{3}\)-hybridized
II. \(\mathrm{B}-\mathrm{H}-\mathrm{B}\) angle is \(180^{\circ}\)
III. There are two terminal \(\mathrm{B}-\mathrm{H}\) bonds for each boron atom
IV. There are only 12 bonding electrons available. Of these statements

1 I, II, and IV are correct
2 I, II, and III are correct
3 II, III, and IV are correct
4 I, III, and IV are correct
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CHXI11:THE P-BLOCK ELEMENTS

316091 All the products formed in the oxidation of \(\mathrm{NaBH}_{4}\) by \(\mathrm{I}_{2}\) are

1 \(\mathrm{B}_{2} \mathrm{H}_{6}+\mathrm{NaI}\)
2 \({{\rm{B}}_{\rm{2}}}{{\rm{H}}_{\rm{6}}}{\rm{,}}{{\rm{H}}_{\rm{2}}}\,{\rm{and}}\,{\rm{NaI}}\)
3 \(\mathrm{BI}_{3}\) and \(\mathrm{NaH}\)
4 \(\mathrm{NaBI}_{4}\) and \(\mathrm{HI}\).
CHXI11:THE P-BLOCK ELEMENTS

316092 Which of the following statements is correct in the context of diborane \(\left(\mathrm{B}_{2} \mathrm{H}_{6}\right)\) ?

1 There are 12 valence electrons-three from each of the two boron atoms and six from the six hydrogen atoms
2 Two of the six hydrogen atoms form two bridges between two boron atoms
3 The two bridging hydrogen atoms are in a plane perpendicular to the rest of the molecule and prevent rotation between the two boron atoms
4 All of these
CHXI11:THE P-BLOCK ELEMENTS

316093 An alkali metal hydride \((\mathrm{NaH})\) reacts with diborane in ' \({\text{A}}\) ' to give a tetrahedral compound ' \({\text{B}}\) ' which is extensively used as reducing agent in organic synthesis. The compound ' \({\text{A}}\) ' and ' \({\text{B}}\) ' respectively are

1 \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) and \(\mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
2 \(\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{O}\) and \(\mathrm{NaBH}_{4}\)
3 \(\mathrm{C}_{2} \mathrm{H}_{6}\) and \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Na}\)
4 \(\mathrm{C}_{6} \mathrm{H}_{6}\) and \(\mathrm{NaBH}_{4}\)
KCET - 2015
CHXI11:THE P-BLOCK ELEMENTS

316094 Consider the following statements for diborane:
I. Boron is approximately \(\mathrm{sp}^{3}\)-hybridized
II. \(\mathrm{B}-\mathrm{H}-\mathrm{B}\) angle is \(180^{\circ}\)
III. There are two terminal \(\mathrm{B}-\mathrm{H}\) bonds for each boron atom
IV. There are only 12 bonding electrons available. Of these statements

1 I, II, and IV are correct
2 I, II, and III are correct
3 II, III, and IV are correct
4 I, III, and IV are correct
NEET DIGITAL LIBRARY
CHXI11:THE P-BLOCK ELEMENTS

316091 All the products formed in the oxidation of \(\mathrm{NaBH}_{4}\) by \(\mathrm{I}_{2}\) are

1 \(\mathrm{B}_{2} \mathrm{H}_{6}+\mathrm{NaI}\)
2 \({{\rm{B}}_{\rm{2}}}{{\rm{H}}_{\rm{6}}}{\rm{,}}{{\rm{H}}_{\rm{2}}}\,{\rm{and}}\,{\rm{NaI}}\)
3 \(\mathrm{BI}_{3}\) and \(\mathrm{NaH}\)
4 \(\mathrm{NaBI}_{4}\) and \(\mathrm{HI}\).
CHXI11:THE P-BLOCK ELEMENTS

316092 Which of the following statements is correct in the context of diborane \(\left(\mathrm{B}_{2} \mathrm{H}_{6}\right)\) ?

1 There are 12 valence electrons-three from each of the two boron atoms and six from the six hydrogen atoms
2 Two of the six hydrogen atoms form two bridges between two boron atoms
3 The two bridging hydrogen atoms are in a plane perpendicular to the rest of the molecule and prevent rotation between the two boron atoms
4 All of these
CHXI11:THE P-BLOCK ELEMENTS

316093 An alkali metal hydride \((\mathrm{NaH})\) reacts with diborane in ' \({\text{A}}\) ' to give a tetrahedral compound ' \({\text{B}}\) ' which is extensively used as reducing agent in organic synthesis. The compound ' \({\text{A}}\) ' and ' \({\text{B}}\) ' respectively are

1 \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) and \(\mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
2 \(\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{O}\) and \(\mathrm{NaBH}_{4}\)
3 \(\mathrm{C}_{2} \mathrm{H}_{6}\) and \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Na}\)
4 \(\mathrm{C}_{6} \mathrm{H}_{6}\) and \(\mathrm{NaBH}_{4}\)
KCET - 2015
CHXI11:THE P-BLOCK ELEMENTS

316094 Consider the following statements for diborane:
I. Boron is approximately \(\mathrm{sp}^{3}\)-hybridized
II. \(\mathrm{B}-\mathrm{H}-\mathrm{B}\) angle is \(180^{\circ}\)
III. There are two terminal \(\mathrm{B}-\mathrm{H}\) bonds for each boron atom
IV. There are only 12 bonding electrons available. Of these statements

1 I, II, and IV are correct
2 I, II, and III are correct
3 II, III, and IV are correct
4 I, III, and IV are correct
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CHXI11:THE P-BLOCK ELEMENTS

316091 All the products formed in the oxidation of \(\mathrm{NaBH}_{4}\) by \(\mathrm{I}_{2}\) are

1 \(\mathrm{B}_{2} \mathrm{H}_{6}+\mathrm{NaI}\)
2 \({{\rm{B}}_{\rm{2}}}{{\rm{H}}_{\rm{6}}}{\rm{,}}{{\rm{H}}_{\rm{2}}}\,{\rm{and}}\,{\rm{NaI}}\)
3 \(\mathrm{BI}_{3}\) and \(\mathrm{NaH}\)
4 \(\mathrm{NaBI}_{4}\) and \(\mathrm{HI}\).
CHXI11:THE P-BLOCK ELEMENTS

316092 Which of the following statements is correct in the context of diborane \(\left(\mathrm{B}_{2} \mathrm{H}_{6}\right)\) ?

1 There are 12 valence electrons-three from each of the two boron atoms and six from the six hydrogen atoms
2 Two of the six hydrogen atoms form two bridges between two boron atoms
3 The two bridging hydrogen atoms are in a plane perpendicular to the rest of the molecule and prevent rotation between the two boron atoms
4 All of these
CHXI11:THE P-BLOCK ELEMENTS

316093 An alkali metal hydride \((\mathrm{NaH})\) reacts with diborane in ' \({\text{A}}\) ' to give a tetrahedral compound ' \({\text{B}}\) ' which is extensively used as reducing agent in organic synthesis. The compound ' \({\text{A}}\) ' and ' \({\text{B}}\) ' respectively are

1 \(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) and \(\mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
2 \(\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{O}\) and \(\mathrm{NaBH}_{4}\)
3 \(\mathrm{C}_{2} \mathrm{H}_{6}\) and \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Na}\)
4 \(\mathrm{C}_{6} \mathrm{H}_{6}\) and \(\mathrm{NaBH}_{4}\)
KCET - 2015
CHXI11:THE P-BLOCK ELEMENTS

316094 Consider the following statements for diborane:
I. Boron is approximately \(\mathrm{sp}^{3}\)-hybridized
II. \(\mathrm{B}-\mathrm{H}-\mathrm{B}\) angle is \(180^{\circ}\)
III. There are two terminal \(\mathrm{B}-\mathrm{H}\) bonds for each boron atom
IV. There are only 12 bonding electrons available. Of these statements

1 I, II, and IV are correct
2 I, II, and III are correct
3 II, III, and IV are correct
4 I, III, and IV are correct
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