This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Step 1: Analyze Question 47. Ethers are organic compounds characterized by an oxygen atom connected to two alkyl or aryl groups. Their general formula is R-O-R^1, where R and R^1 can be the same or different. • A. ROH is the general formula for alcohols. • B. RCOOR^1 is the general formula for esters. • C. RX is the general formula for alkyl halides. The correct option is D. D. ROR^1 Step 2: Analyze Question 48. The given third member of the homologous series is C_3H_6. For n=3, the formula C_nH_2n gives C_3H_2 × 3 = C_3H_6. This is the general formula for alkenes. Therefore, the homologous series is alkenes. The members of the alkene series are: 1st member: Ethene (C_2H_4) 2nd member: Propene (C_3H_6) - This is incorrect, propene is the first member with 3 carbons, but the second member of the series if we start from n=2. If the question implies the third member in terms of carbon count, then it's propene. Let's assume it means the third compound in the series starting from the smallest possible alkene. The first alkene is ethene (C_2H_4). The second alkene is propene (C_3H_6). The third alkene is butene (C_4H_8). The question states C_3H_6 is the third member. This implies the series starts with n=1 or n=2 and C_3H_6 is the third in that sequence. If C_3H_6 is the third member, then the first member would be C_1H_2 (which doesn't exist as a stable alkene) or C_2H_4 (ethene) as the second member. Let's assume the question implies the number of carbon atoms for the "member". So, a 3-carbon alkene is the third member. If the 3-carbon alkene (C_3H_6) is the third member, then: 1st member: C_1H_2 (hypothetical) 2nd member: C_2H_4 (ethene) 3rd member: C_3H_6 (propene) 4th member: C_4H_8 (butene) 5th member: C_5H_10 (pentene) The correct option is C. C. pentene Step 3: Analyze Question 49. A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. In reversible reactions, a catalyst speeds up both the forward and reverse reactions equally, thereby allowing the system to reach equilibrium more quickly. It does not change the position of the equilibrium. The correct option is C. C. catalyst Step 4: Analyze Question 50. The process of treating natural rubber with heat and sulfur is called vulcanization. This process forms cross-links between polymer chains, which significantly improves the elasticity, strength, and durability of the rubber, making it more suitable for various applications like tires. The correct option is C. C. vulcanization 3 done, 2 left today. You're making progress.