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Select the correct alternative from the choices given: (i) The packing efficiency of simple cubic…
Select the correct alternative from the choices given:
(i) The packing efficiency of simple cubic structure, body centered cubic structure and face centered cubic structure respectively is:
(1) $52\cdot4\%$, $74\%$, $68\%$
(2) $74\%$, $68\%$, $52\cdot4\%$
(3) $52\cdot4\%$, $68\%$, $74\%$
(4) $68\%$, $74\%$, $52\cdot4\%$
(ii) When acetone is treated with Grignard’s reagent, followed by hydrolysis, the product formed is:
(1) Secondary alcohol
(2) Tertiary alcohol
(3) Primary alcohol
(4) Aldehyde
(iii) Which of the following electrolytes is least effective in causing flocculation of positively charged ferric hydroxide sol?
(1) $\text{K}_3[\text{Fe}(\text{CN})_6]$
(2) $\text{K}_2\text{CrO}_4$
(3) $\text{K}_4[\text{Fe}(\text{CN})_6]$
(4) $\text{KBr}$
(iv) On heating an aliphatic primary amine with chloroform and alcoholic potassium hydroxide, the organic compound formed is an:
(1) Alkyl isocyanide
(2) Alkanol
(3) Alkanal
(4) Alkyl cyanide
Answer
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From ISC 2020 Chemistry Paper 1, question 1(b).